4 inch Diamond Hole Saw Drill Bit Glass Ceramic Porcelain Tiles, Marble Granite Quartz Drilling Shower Valve Hole Cutter Floor Wall Tiles Solid Steel Body Spins True Template Included

Had to only cut 3 holes on porcelain tile. Worked great, easy to used and did not seem to dull any.

Product would have been good had it had a central pin to secure it from spinning off course.

Went through ceramic tile just fine. Was able to enlarge the hole to fit by tilting the saw a little to start, then sheering off sections.

I consider this more of a grinder than a saw, and it did a nice job on some "high dollar" marble I'm using for a bathroom counter.I down graded it slightly, because there is no pilot bit -- and that makes it difficult to use. I'm skeptical about entering the hole at a 45° angle (as they recommend), and I really didn't want to screw up my expensive marble -- so I made a template out of ¾" plywood (as the pictures indicate) -- and that worked well.The cut was very smooth and went well; except the bit wasn't quite deep enough to get through my 3cm/1 ¼" marble -- so I had to buy a real hole saw to complete the cut.That said -- I think I'd still use this grinder, because the initial cut was so smooth.Go slow (around 100 rpm's) and use a lot of water.

I own 4" and 5" Drilax diamond hole saws along with assorted smaller diamond hole saws from other Amazon sellers. I think the Drilax saws are of significantly higher-quality -- I'd rate them as prosumer tools that will readily stand up to any DIY project. Whether you want the hole or the disc, this saw will get it done in quick order. I believe the depth-of-cut claim of 1-1/8" to 1-1/4" in the product description is questionable; I purchased my 4" saw in Dec. 2021, and it cuts to just under 1". For my application cutting porcelain tile, that's no problem, but there's no excuse for inaccuracies in product descriptions. There are slots and holes in the frame to pry out the core once the cut is complete. The photos show my saw after cutting a half-dozen holes in very hard porcelain tile (wetting the tile while cutting). The diamond matrix looks unscathed, and the last cut was as easy as the first. Cutting is most easily done in a drill press at about 450 rpm, misting water occasionally around the rim., but you can also cut freehand (though it's hard to get a perfect circle): tip the saw and gently engage it at one point on the edge, then slowly bring the saw perpendicular to the surface and continue. Please remember to wear hearing and eye protection.