6-60mm M10 Diamond Hole Saw Core Drill Bit Dry Holesaw Cut Marble Granite Tile. Name: Angle Grinder Drill. Process: Sintering Hot Pressing. Features: Strong And Sharp. Drilling Holes For Tiles/red Bricks And Other Materials. Note: It Is Necessary To Add Water For Cooling During Use, And It Is Forbidden To Drill Tempered Glass. 1: Install The Hole Opener On Angle Grinders And Other Equipment For Use. 2: When Drilling, Lightly Lean Against The Marble At An Oblique Angle. The Smaller The Force, The Less Likely It Is To Slip And Hit The Crescent-shaped Positioning Groove. 3: After Drilling The Positioning Groove, Slowly Vertical Electric Drill, Pressure Drilling At A Constant Speed, And Smooth Operation During The Opening Process, Do Not Bend And Shake. 4: It Is Recommended That The Drill Speed Be Above 100rpm, And Add Water To Cool The Whole Process. 1: When Drilling, You Need To Add Water To Cool The Drill Bit. Good Cooling Can Significantly Extend The Service Life Of The Hole Opener. Do Not Dry Drill Without Adding Water, Otherwise It Will Easily Cause Sharp Saw Wear Of The Drill Bit. 2: Choose The Processing Material, Do Not Drill The Toughened Glass. 3: The Appearance Of The Product Will Be Different, Such As: 6-10mm Hole Opener Is Round Handle. 4: When Punching Holes, Please Pay Attention To Wearing Protective Gloves, Glasses, Masks, Etc. Flying Debris And Dust Enter The Mouth, Nose And Eyes.