Product DescriptionEasy & Agrave; Use Center Pilot Tips Are For Wood, Metal, Etc.Here Is How You Can Keep The Drill Bit On Target:A- You Can Make Your Own Plywood Guide ; - Plastic Or Even Cardboard. You Just Need To Hold The Bit In Place Until What It Marks The Initial Marks.B- It Is Possible To Start Drilling At An Angle, With The Edge Of The Bit Forming A C-Slot And Then Bringing The Bit Vertically.C- You Can Manually Guide The Tip With A Damp Sponge.Applicable Industry: Suitable For To Processing Stone, Tiles, Ceramics, Glass And Granite, Etc.Package Included: 1 * Set Of Diamond Drill BitsMaterial: Iron, Plated; Diamond On The HeadColorSilverQuantity: 15 PiecesTipps: The Diamond Coating Electroplated. Wears Out If The Tool Overheats. Never Let The Bit Dry Out.Here'S How To Use Water To Cool The Tool:A- You Can Build A Mini Water Dam Around The Hole With Plumber'S Grout.B- You Can Choose To Spray Water On The Tip.C- Or You Can Use Running Water To Cool The Tip.Steps: Start To Drill At Starting From The Opposite Corner, Make A Circular Track With A C-Slot, Then Slowly Hold The Drill Straight. If You Smell Burning, Stop Either You'Re Too Fast Or You'Re Putting Too Much Pressure On.Speed Kills: Reduced Drill Speeds, Low Drill Pressure And Increased Use Of Lubrication At Low Pressure. Water Will Greatly Extend The Life Of The Drill. About 3Cm; Water Is Required When Drilling For Lubrication.Set Of 7 Multi-Material Tile Drill Bits,Double Cut Tungsten Burres For Rotary ToolsDiamond Drill Bits S Of Quality Superior Carbon Steel20Pcs Diamond Rotary Burrs For Wood CarvingHss Rotary Burrs Router Bits Countersunk WoodDrill MaterialCemented Carbide Tungsten Steel Steel, The Head Plating Is Diamond Rod Body Is Carbon Steel And The Head Is Diamond Plated Tungsten Steel High SpeedRange Of Applicable MaterialsGlass, Tiles, Ceramics, Granite, Wood, Cement Walls It Can Be Used For Cast Iron, Cast Steel, Carbon Steel High Carbon, Chromium-Nickel Alloy, Copper And Other Metals. Marble, Jade, Bone And Other Non-Metals Glass, Tile, Marble, Granite, Ceramic Jade, Stone Stele, Wood Wood, PlasticHow To UseDrilling Engraving, Flashing, Deburring And Other Processing Drill Holes, Available In 10 Sizes Carving Or Peeling Engraving, Hollowing, Slotting, PolishingQuantity7 Pcs 10 Pcs 10 Pcs 20 Pcs 20 Pcs