1-1/4 Inch Dry Diamond Core Drill Bit for Tile and Stone Review
A 32mm vacuum brazed diamond core bit for clean holes in porcelain, granite, and stone.
| Diameter | 1-1/4 inch (32mm) |
|---|---|
| Arbor | 5/8-11 thread |
| Diamond height | 5/8 inch (15mm) |
| Total length | 2-3/8 inch (61mm) |
| Max cutting depth | 1-5/8 inch (40mm) |
| Bond | Vacuum brazed diamond |
| Best for | cutting 32mm holes in tile and stone |
Product Overview
This 1-1/4 inch (32mm) dry diamond core drill bit cuts clean holes in porcelain, tile, granite, marble, stone, brick, and non-reinforced concrete. Vacuum brazed diamond grit and a 5/8-11 arbor make it a fit for tilers and countertop installers who run angle grinders or wet polishers.
Maximum cutting depth reaches 1-5/8 inch (40mm), and diamond height measures 5/8 inch (15mm). An included 3/8 inch hex shank adapter lets you switch the bit into a drill. Owners aiming at faucet holes and sink cutouts get a compact single-bit answer.
Score Breakdown
This verdict is based on the manufacturer's stated specifications, the current Amazon listing and its product images, the confirmed materials and design, real buyer ratings, and our research into the product category. Scores are consistent editorial judgments, not laboratory measurements, and we did not receive a paid sample.
Key Features
Bonded grit cuts porcelain, granite, marble, and stone.
Works both dry and wet per the listing.
Fits many angle grinders and wet polishers.
3/8 inch hex shank lets a drill run the bit.
Shapes faucet holes and rounded sink corners.
Design and Build Quality
Construction centers on a vacuum brazed diamond core body. Diamond grit is bonded around the tube, giving cutting edges that work through hard mineral surfaces both dry and wet.
Sizing stays fixed. Hole saw diameter is 1-1/4 inch (32mm), total length runs 2-3/8 inch (61mm), and diamond height sits at 5/8 inch (15mm). The maker lists a maximum cutting depth of 1-5/8 inch (40mm).
Mounting uses a 5/8-11 female threaded arbor, common on angle grinders and wet polishers. A 3/8 inch hex shank adapter ships in the box, so drills and other hex-accepting machines can drive the bit too.
Performance in Everyday Use
Diamond grain design supports fast, smooth drilling through porcelain, granite, marble, and masonry. Owners report clean rounded corners when shaping square or rectangular sink cutouts, and tidy faucet-mounting holes in countertops and vanities.
Both dry and wet cutting are supported per the listing. Adding water when drilling glass, tile, or stone helps clear debris and can extend the working life of the bit.
One firm limit stands out. The maker states you must not use this bit on hammer mode, which rules out standard hammer drills for percussion work. It also handles non-reinforced concrete only, so rebar and reinforced slabs fall outside its stated range.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Vacuum brazed diamond | Bonded grit cuts porcelain, | Maker stated | 8.6 | Bonded grit cuts porcela |
| Dual mode cutting | Works both dry and wet per t | Maker stated | 8.6 | Works both dry and wet p |
| 5/8-11 arbor | Fits many angle grinders and | Maker stated | 8.6 | Fits many angle grinders |
| Hex adapter included | 3/8 inch hex shank lets a dr | Maker stated | 8.6 | 3/8 inch hex shank lets |
| Countertop ready | Shapes faucet holes and roun | Maker stated | 8.6 | Shapes faucet holes and |
Who Should Buy It
- DIY tilers
- Countertop installers
- Faucet hole drilling
- Sink cutout corners
- Angle grinder owners
- reinforced concrete or percussion drilling
- Facts are maker-stated, not lab-tested
- Single fixed 32mm size only
- Must not run on hammer mode
- Rated for non-reinforced concrete only
Full Specifications
How It Compares
| Feature | Generic | Typical budget | Premium option |
|---|---|---|---|
| Diameter | 1-1/4 inch (32mm) | Basic | Better |
| Arbor | 5/8-11 thread | Basic | Better |
| Diamond height | 5/8 inch (15mm) | Basic | Better |
| Total length | 2-3/8 inch (61mm) | Basic | Better |
Alternatives Worth a Look
This diamond core bit answers one job well, cutting a 1-1/4 inch (32mm) hole through porcelain, granite, marble, and similar hard surfaces. The 5/8-11 arbor plus the bundled hex adapter gives real flexibility, letting you run it on an angle grinder, a wet polisher, or a standard drill. Countertop installers and DIY tilers making faucet or sink openings are the natural fit. Two limits matter. Hammer mode is off the table, and the bit is rated for non-reinforced concrete only, so reinforced slabs are out. Wet cutting with water helps clear dust and prolong life. As a single fixed-size tool, it does its stated task and skips the rest.
Frequently Asked Questions
What can this diamond core bit drill through?
Based on the listing, it cuts porcelain, tile, granite, marble, stone, masonry, block, brick, and non-reinforced concrete. It handles both dry and wet drilling. Adding water on glass or stone helps clear debris and can extend the working life of the bit.
Does it fit an angle grinder?
Yes. The bit uses a 5/8-11 threaded female arbor, which the maker states fits most popular angle grinders and wet polishers. An included 3/8 inch hex shank adapter also lets you run it in a standard drill or other hex-accepting machine.
Can I use it on hammer mode?
No. The maker clearly states you must not use this core bit on hammer mode. Percussion action can damage the diamond bond. Run it in rotary mode only, on a grinder, wet polisher, or drill, and let the diamond grit do the cutting.
What size hole does it make?
The hole saw diameter is 1-1/4 inch, which is 32mm. Maximum cutting depth is 1-5/8 inch (40mm) and diamond height is 5/8 inch (15mm). This is a single fixed size, so it drills only 32mm openings.
Is it good for countertop faucet holes?
Yes. The maker states it suits drilling faucet-mounting holes in countertops and vanities. It also makes clean rounded corners for square or rectangular sink cutouts. Owners report smooth results when water is used to keep dust down.
This review draws on the maker's stated features and the product listing. Dimensions, materials, and compatibility are reported as stated by the seller and are not lab-tested by us. Any rating shown is an editorial score, not a measured result or a customer star average.