FOCSTOL 5-Piece 10mm Dry Diamond Hole Saw Kit Review
A 5-piece 10mm diamond hole saw kit with cooling wax and a quick-change hex shank for tidy holes in porcelain, granite, and quartz.
| Pieces | 5 |
|---|---|
| Diameter | 10mm (3/8 inch) |
| Total length | 65mm |
| Diamond height | 8mm |
| Grit | 50/60 |
| Shank | 6.35mm hex |
| Best for | 10mm holes in porcelain, granite, and quartz |
Product Overview
FOCSTOL's 5-piece kit gives five 10mm diamond hole saws for hard tile and stone. Each bit measures 65mm long with an 8mm diamond height at grit 50/60. It suits porcelain, ceramic, marble, granite, artificial stone, and quartz, whether drilled dry or wet.
Two design touches help it work. Vacuum brazed technology bonds the diamond grains for faster, smoother cutting, and internal cooling wax aids heat dissipation and chip evacuation. A 6.35mm quick-change hex shank gives stable clamping in most drills.
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 grains aim for fast, smooth cutting and longer life.
Wax fill aids heat dissipation and chip evacuation.
Cuts porcelain, marble, granite, artificial stone, and quartz.
6.35mm shank clamps stably in most drills.
Works on an angle grinder with a drill chuck fitted.
Design and Build Quality
Each hole saw uses a 10mm diameter body 65mm long, with the diamond section standing 8mm tall at grit 50/60. The diamond grains are bonded using vacuum brazed technology, which the maker links to fast, smooth drilling and longer working life.
Inside each bit sits cooling wax. The listing says this fill helps heat dissipation and chip evacuation, both important when grinding through dense stone that builds heat quickly.
The 6.35mm hex shank is built for quick-change chucks and stable clamping. The maker notes an angle grinder can also drive these bits if you fit an angle grinder drill chuck.
Performance in Everyday Use
These bits are made for the hardest tile and stone. According to the listing, the vacuum brazed diamonds cut porcelain, ceramic, marble, granite, artificial stone, and quartz. That is material carbide masonry bits struggle with.
Cooling is the practical concern. The internal wax helps, and the maker states wet use prolongs the working life. Adding water on porcelain and granite manages the heat that would otherwise wear diamonds fast.
Speed guidance is at least 2000 RPM, with higher RPM extending life. Note the fixed scope: this kit is 10mm only, so other diameters need separate bits. Steady pressure and cooling matter more than force. Longevity claims are maker-stated.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Vacuum brazed diamonds | Bonded grains aim for fast, | Maker stated | 8.4 | Bonded grains aim for fa |
| Internal cooling wax | Wax fill aids heat dissipati | Maker stated | 8.4 | Wax fill aids heat dissi |
| Hard-stone coverage | Cuts porcelain, marble, gran | Maker stated | 8.4 | Cuts porcelain, marble, |
| Quick-change hex shank | 6.35mm shank clamps stably i | Maker stated | 8.4 | 6.35mm shank clamps stab |
| Grinder compatible | Works on an angle grinder wi | Maker stated | 8.4 | Works on an angle grinde |
Who Should Buy It
- Tile fitters
- Stone fabricators
- Bathroom fixture holes
- Countertop drilling
- Renovation projects
- large-diameter or soft-material drilling
- Only one 10mm diameter in the kit
- Hard stone really needs wet drilling for longevity
- Not intended for soft materials or metal
- Durability claims are maker-stated, not lab-tested
Full Specifications
How It Compares
| Feature | Generic | Typical budget | Premium option |
|---|---|---|---|
| Pieces | 5 | Basic | Better |
| Diameter | 10mm (3/8 inch) | Basic | Better |
| Total length | 65mm | Basic | Better |
| Diamond height | 8mm | Basic | Better |
Alternatives Worth a Look
FOCSTOL's diamond hole saw kit answers a specific need: clean 10mm holes in porcelain, granite, quartz, and other hard stone. Vacuum brazed diamonds and internal cooling wax are the reasons it can go where carbide masonry bits falter. The 6.35mm quick-change shank fits most drills, and an angle grinder works with the right chuck. Follow the guidance, keep it wet on dense stone, and run at least 2000 RPM to protect the diamond. The obvious limit is scope: every bit is 10mm, so other sizes mean buying more. Durability figures are maker-stated rather than tested. For tilers and stone workers needing a repeatable 10mm hole, it is a focused, capable kit.
Frequently Asked Questions
What materials do these diamond bits cut?
Per the listing, they suit porcelain, ceramic tile, marble, granite, artificial stone, and quartz, drilled dry or wet. Wet use prolongs their life. These are dense materials where diamond outperforms carbide masonry bits, which is the main reason to reach for a brazed diamond hole saw.
Do I have to use water with these bits?
You can drill dry or wet, but the maker says wet use prolongs the working life. On hard porcelain and granite, water sheds the heat that wears diamond grains. Internal cooling wax also helps dissipate heat and clear debris, so cooling matters most on dense stone.
What size holes do these make?
Every bit in this kit is 10mm, roughly 3/8 inch, with a total length of 65mm and an 8mm diamond height. If you need other diameters, you will need separate bits. The single size keeps the kit focused on repeatable 10mm holes in tile and stone.
Can I use these on an angle grinder?
Yes. The maker recommends corded, cordless, or benchtop drills, and notes an angle grinder works if you install an angle grinder drill chuck. The 6.35mm hex shank clamps stably. Recommended speed is at least 2000 RPM, with higher RPM extending the bit's life.
How long will these diamond bits last?
The listing credits vacuum brazed technology and quality diamond grains for a longer working life, and adds that wet use extends it further. Actual longevity depends on material, cooling, and speed. These are maker-stated claims reported as described, not results we measured in testing.
This review draws on the maker's stated features and the product listing. Dimensions, grit, the vacuum brazed bonding, cooling wax, and RPM guidance are reported as described, not independently lab-tested here. Any score is an editorial view of the stated design and its intended use, not a measured field result.