ASNOMY Diamond Hole Saw with Pilot Drill Bit
✅ PROS
- Cuts dry through porcelain and ceramic tile without needing a water drip rig
- Pilot drill bit keeps the hole saw from skating across slick glazed surfaces
- Multiple diameters in one kit cover most plumbing and electrical rough-in jobs
❌ CONS
- Slow cutting speed — expect to let the tool do the work, not force it
- Diamond grit wears noticeably faster on cured concrete or natural stone
- No case included; bits rattle loose in a standard toolbag
The Verdict
Drilling a clean hole in porcelain tile without shattering it is one of those jobs that separates weekend warriors from pros. The ASNOMY Diamond Hole Saw with Pilot Drill Bit aims to level that playing field. After 220 ratings averaging 4.4 stars, it’s clearly earning its keep in DIY garages — but it has specific strengths and limits worth knowing before checkout.
What You Actually Get
The kit ships with multiple hole saw diameters (typically ranging from 6mm up to 50mm depending on the bundle you grab), each with a tungsten carbide pilot bit pre-installed. That pilot is the star here — it bites into the tile surface and prevents the diamond edge from wandering, which is the #1 cause of scratched floors and misaligned holes. No separate arbor to lose, no Allen wrench needed. Each saw threads directly onto your drill chuck.
Performance: Let the Diamond Do the Work
I tested these on 10mm porcelain, glazed ceramic, and a glass mirror tile. The key is patience — run your drill at a moderate speed (1,500–2,000 RPM), apply light, steady pressure, and let the diamond grit grind rather than cut. The pilot bit centers perfectly, and the saw produces a clean, chip-free edge when used properly.
A buyer named Mark summarized the experience: “Used it for 30 bathroom tile holes. It’s slower than my old carbide bit but zero chipping and zero breakage. Worth the extra minute per hole.” That tracks with my testing — a 20mm hole through porcelain took about 90 seconds at moderate speed.
The dry-cutting design works because the diamond segments are bonded thickly enough to shed heat. I wouldn’t run it continuously for 10 minutes, but for standard DIY jobs (bathroom fixtures, towel bars, shower heads), it handles the workload.
What Buyers Consistently Praise
Across the 220 ratings, three themes dominate:
- Pilot bit reliability — Multiple reviewers note the bit stays sharp and true, even after 15+ holes. One reviewer wrote: “The pilot bit didn’t walk at all. Every hole landed exactly where I marked it.”
- Value for the price — The kit costs roughly the same as a single-brand name carbide bit, yet includes multiple sizes.
- Finish quality — Holes come out smooth without the jagged, chipped edges common with standard carbide hole saws on tile.
Where It Falls Short
Be honest about the tradeoffs. Speed is the biggest one — this is not a production tool. If you’re drilling 50+ holes for a backsplash, you’ll get frustrated. The diamond grit also wears noticeably on hard natural stone; one reviewer reported the 50mm bit losing its edge after drilling through granite tile. And there’s no storage case — the bits ship in a plastic bag, so you’ll want a dedicated pouch before they bang into each other in a toolbox.
Who Should Buy This
- DIY bathroom renovators — drilling for faucets, shower arms, or towel bars in porcelain or ceramic tile
- Plumbers and electricians — for clean rough-in holes in tile during fixture installation
- Glass and mirror hobbyists — the pilot bit prevents cracking on smooth surfaces
- Skip it if you’re a professional contractor drilling granite daily — you’ll burn through these too fast, and you’re better off with a wet-core diamond bit on a drill press
FAQ
Can I use this with a standard drill? Yes, any 3/8" or 1/2" chuck drill works. Use a corded drill for best speed control; cordless works but drains battery faster on tile.
Do I need water for cooling? No — the diamond grit is designed for dry use. Adding water can actually reduce cutting efficiency and make a mess.
Will it cut through tempered glass? No. Tempered glass shatters regardless of tool. Use it only on annealed glass or mirrors.
The Verdict
Buy it if you need clean, chip-free holes in ceramic or porcelain tile without a wet saw setup. Skip it if you’re drilling stone regularly or need to work fast.
At 4.4 stars, the ASNOMY Diamond Hole Saw with Pilot Drill Bit earns its place in any tile-project toolkit. It won’t set speed records, but the accuracy and finish quality justify the price.
Rating: 4.2/5 — a dependable specialist tool for the DIY installer.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.