1PCS Diamond Holesaw, Coated Core Hole Saw Drill Bit Tile Cutter Set Tipped Porcelain Tiles for Glass, Ceramics, Porcelain, Ceramic Tile, Marble 40mm

17 Sizes, Meet All Your Needs -- Size diameter included 4mm 5mm 6mm, 8mm, 10mm, 12mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 40mm, 45mm. SUPER MATERRIAL: These diamond drill bits made of high-speed steel that is durable and have a long service life, which are high quality and good performance that excellent for making clean and accurate hole. SHARP&SMOOTH CUT: Coated with high quality diamond, the diamond hole saw creates a high precision, smooth cut with no broken edges. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. WIDELY USE: Suitable for use in drill hole on glass, marble, tile, blocks jars, fiberglass porcelain tile ceramic, slate marble, granite light Stone etc. Will work with all electric drill and impact drill. NOTE: These bits is installed on a professional drill or electric drill, bench drill. Rpm 800-1000 rpm or so, you must add water cooling holes during operation.