ITEM NAME:15Pcs/set 6mm-50mm Diamond Holesaw Drill Bit Tool for Ceramic Porcelain Gla E2U2 15Pcs/set 6mm-50mm Diamond Holesaw Drill Bit Tool for Ceramic Porcelain Gla E2U2 100% brand new and high quality. This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other. Materials and only needs water for lubrication. Always use lubrication (water), 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. Size: 6/8/10/12/14/16/18/20/22/25/26/28/30/40/50mm 0.23/0.31/0.39/0.47/0.55/0.62/0.7/0.78/0.86/0.98/1.02/1.10/1.18/1.57/1.97" Quantity: 15 pcs Packaged included: 1 x 15pcs Diamond Coated Hole Saw Drill Bits 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.