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Drilling glass demands a specialized cutting edge. Standard high-speed steel bits will walk, bind, and shatter your workpiece before you ever get a hole started. This narrow category of diamond-tipped and diamond-impregnated bits uses superabrasive grit to grind through the brittle matrix of glass, ceramic, and stone safely.
I’m Mohammad Maruf — the founder and writer behind WellFizz. This guide is built from cross-referencing customer performance data across hundreds of drilling sessions, analyzing grit composition and shank fitment, and identifying which bits actually survive their first five holes.
You need a bit that resists thermal shock, stays sharp through multiple uses, and fits your tool platform. This review covers the top options to help you find the right drill bit for glass.
How To Choose The Best Drill Bit For Glass
Choosing the wrong bit for glass leads to chipped edges, shattered panels, and wasted money. The three factors that matter most are the abrasive type, the shank style, and the bit geometry.
Diamond Grit vs. Carbide Tipped
For glass, diamond is the only reliable abrasive. Carbide-tipped bits may work on soft tile, but they dull rapidly against hardened glass and cause excessive heat buildup. Diamond grit — either electroplated onto a steel core or impregnated into a sintered matrix — grinds glass particles away rather than trying to cut them. This makes diamond bits much safer and more durable for the task.
Shank Compatibility
Most glass drill bits use a 1/8-inch (3mm) straight shank designed for rotary tools like a Dremel. Some larger hollow-core bits use a 5/8-11 thread to mount directly onto an angle grinder. Check your tool’s collet or chuck size before buying. Using an adapter can cause wobble, which leads to uneven holes and increased breakage risk.
Cooling Strategy
Friction generates heat that expands glass unevenly, causing cracks. Bits designed with internal cooling wax, side holes for water flow, or reverse spiral threads that draw water into the cut zone dramatically reduce failure rates. If you are drilling without integrated cooling, you must pause frequently and apply water with a sponge or spray bottle.
Quick Comparison
On smaller screens, swipe sideways to see the full table.
| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| DEWALT DW5572 | Premium Single Bit | Durable multi-hole tile & glass drilling | Diamond welded tip, 1/4″ | Amazon |
| Dremel 663DR | Premium Rotary Bit | Fast holes in flat & contoured glass | Diamond-impregnated, 1/4″ | Amazon |
| DKIBBITH Core Set | Mid-Range Core Bits | Angle grinder drilling in tile & masonry | Hollow core, 5/8-11 thread, 1/4″ | Amazon |
| YURINWOO Set | Budget Burr Set | Engraving, grinding & detail work | 20pcs, 1/8″ shank, diamond coat | Amazon |
| Funrous Grinder Bit | Budget Replacement | Stained glass grinder shaping | 1″ diamond-plated, brass core | Amazon |
In‑Depth Reviews
1. DEWALT Tile Drill Bit (DW5572)
DEWALT’s DW5572 uses a diamond-welded tip that bonds diamond grit directly to the steel body, offering greater durability than electroplated coatings. Users report drilling a dozen or more holes in 1/2-inch porcelain tile with a single bit, which is exceptional wear life for this category.
The reverse spiral thread is a key engineering detail — it pulls water down into the cut as you drill, keeping the interface cool and flushing away glass slurry. This cooling action directly prevents the thermal shock that causes blowouts on the back side of the hole. The core ejection slot also clears the plug quickly, making repetitive drilling much faster.
Some users note difficulty starting the hole because the diamond tip can walk. Using a piece of duct tape or a pre-drilled template board solves this. At this price point, you are paying for repeated reliability rather than a single-use bit.
Why it’s great
- Diamond welded tip outlasts plated competitors by several holes
- Reverse spiral effectively pulls coolant into the drilling zone
- Core ejection slot speeds up plug removal
Good to know
- Tip tends to walk on smooth glass; use a template
- Single bit only, no multi-size kit
2. Dremel 663DR Glass Drilling Bit
The Dremel 663DR is diamond-impregnated, meaning diamond particles are embedded throughout the metal matrix rather than just coated on the surface. As the matrix wears, fresh diamond grit is exposed, giving this bit a lifespan that easily outpaces electroplated alternatives. It drills holes in glass tile in roughly three minutes — a dramatic improvement over standard carbide bits that can take 30 minutes.
Because the diamond grit runs around the entire circumference (360 degrees), you can also rasp the hole larger if needed, turning a 1/4-inch pilot into a bigger opening. The side holes allow glass dust and water to escape, preventing clogging and keeping the cutting face clear. Submerging the workpiece in water during drilling virtually eliminates the risk of cracking.
Be prepared for loud operation — the diamond grinding action produces a high-pitched noise that makes ear protection essential. Some users have reported early failure on the fifth hole due to overheating, so keeping the bit wet and using slow, steady pressure is critical for longevity.
Why it’s great
- Diamond-impregnated matrix keeps cutting long after coatings wear off
- Full circumference grit allows hole enlargement
- Side ports clear debris and improve coolant flow
Good to know
- Very loud during operation; hearing protection is required
- Overheating can cause premature failure; must keep water on the bit
3. DKIBBITH Diamond Core Drill Bits Set (2-Pack)
This hollow-core diamond bit set from DKIBBITH brings angle grinder capability to glass drilling. The 5/8-11 thread mounts directly onto standard angle grinders or wet polishers, making it a powerful option for quickly boring through tile, glass, masonry, and stone. The hollow core design leaves a clean round hole and removes a solid plug of material rather than grinding it all to dust.
Internal cooling wax is packed inside each bit, which melts during drilling to provide lubrication and heat dissipation. This wax barrier significantly reduces thermal shock risk during dry drilling, though wet drilling still produces the best results on glass. The 45-degree start technique — beginning at an angle to cut a groove before straightening — helps prevent the bit from skating on smooth surfaces.
These bits wear faster than solid diamond-tipped options because the diamond layer is relatively thin. They are best for occasional use on tile or thin glass rather than high-volume production. Having two bits in the pack gives you a backup when the first dulls.
Why it’s great
- Hollow core produces clean holes with minimal chipping
- Built-in cooling wax helps prevent thermal cracks during dry drilling
- 5/8-11 thread fits most angle grinders and polishers
Good to know
- Diamond layer is thin; wears relatively fast on hard glass
- Requires a 45-degree start technique to prevent walking
4. YURINWOO Diamond Burr Bit Set (20-Piece)
YURINWOO’s 20-piece diamond burr set is an entry-level kit designed for engraving, grinding, and detail drilling rather than clean through-holes. The bits feature an electroplated diamond coating on a steel core with a universal 1/8-inch shank that fits any standard rotary tool. The variety of shapes — sphere, cone, cylinder, bullet, flat plate — gives you flexibility for freehand carving and surface work on glass, stone, and tile.
Customer feedback consistently notes that these bits get the job done for small detail jobs but do not last forever. The electroplated coating will wear off after moderate use, especially under high pressure or without coolant. For the price of a single premium bit, you get a whole set that can help you determine which shapes you actually need before investing in higher-end versions.
A sturdy plastic storage case keeps them organized, and the universal shank works with Dremel, WEN, and generic rotary tools. If your goal is engraving drinking glasses or polishing sharp edges, this set offers good value. For drilling clean holes through bottle glass, a dedicated hollow-core or diamond-tipped bit is a better choice.
Why it’s great
- Twenty assorted shapes cover engraving, grinding, and polishing needs
- Universal 1/8-inch shank fits all common rotary tools
- Compact storage case keeps bits organized
Good to know
- Electroplated coating wears off faster than sintered diamond bits
- Not ideal for producing clean, round through-holes in glass
5. Funrous Stained Glass Grinder Bit (1-Inch)
This Funrous diamond grinding head is specifically designed for stained glass grinders, not rotary tools or drill presses. It has a 1-inch diameter cutting face with diamond grit double-plated onto a brass core. The brass core reduces shaft binding in the grinder’s collet, and the chrome-plated shank adds corrosion resistance.
For stained glass artisans, this bit excels at shaping edges, smoothing curves, and refining cuts on colored glass pieces before assembly. The standard frosted grinding surface removes glass quickly without chipping. Users who own a Glastar or Gryphon grinder report it fits and functions as a direct replacement for OEM bits.
The main tradeoff is lifespan — multiple users note that these bits do not last as long as the higher-priced originals. The electroplated diamond layer wears down gradually, and once the grit is gone, the bit is effectively dead. It is a solid budget-friendly backup or starter bit for hobbyists, but serious production artists may want to invest in sintered diamond alternatives for longer service life.
Why it’s great
- Brass core reduces shaft binding in stained glass grinders
- Double-plated diamond bonding resists peeling longer than single-plate bits
- Compatible with most brand-name glass grinders
Good to know
- Wears faster than OEM sintered or higher-quality bits
- Intended for edge shaping, not for drilling through-holes
FAQ
Do I need water to drill glass with a diamond bit?
Can I use a standard twist drill bit on glass?
How do I stop the bit from walking on smooth glass?
What speed should I run my drill when drilling glass?
Final Thoughts: The Verdict
For most users, the drill bit for glass winner is the DEWALT DW5572 because its diamond-welded tip and reverse spiral cooling system deliver reliable, long-lasting performance across tile and glass drilling tasks. If you need fast, precise holes in contoured glass objects, grab the Dremel 663DR. And for stained glass edge shaping or hobby engraving, the YURINWOO burr set provides versatile shapes at minimal cost.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.