Sell 12 Pcs Diamond Drill Bits - Glass and Tile Hollow Core Drill Bits Extractor Remover Tools Hole Saws for glass, ceramics, porcelain, ceramic etc best price

This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only needs Note: If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm. Please: Always use water for lubrication., otherwise the diamond core drill will burn.Can be used with a standard electric drill. Start your hole diagonally, make a round trace and then hold drill straight. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.Use Coolant.Minimum pressure.The general rule is the smaller the diameter of your drill bit, the faster drill speed you can use. The harder your material, the slower drill speed you should use. Materials: Steel colour: Sier specification: 1*4mm, 1*5mm, 1*6mm, 1*8mm, 1*10mm, 1*14mm, 1*16mm, 1*18mm, 1*22mm, 1*35mm, 1840mm, 1*50mm size:200*60*60mm Package include: 1set x Diamond bit set Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.