Description: 10pcs Diamond Hole Saw Drill Bit Set 6mm-30mm Tile Ceramic Glass Porcelain Marble Hole Saw Cutter   Specifications: Material: Steel Size: 6mm\/0.23"、 8mm\/0.31"、 10mm\/0.39"、 12mm\/0.47"、 15mm\/0.59"、         16mm\/0.62"、 18mm\/0.7"、 20mm\/0.79、 22mm\/0.86"、 30mm\/1.18" Quantity: 10pcs   Features: Can be used with a standard electric drill. Always use lubrication (water)、 otherwise the diamond core drill will burn. Materials and only needs water for lubrication. This diamond coated core drill bit removes a complete circle from glass、 marble、 tiles、granite、 ceramic or other.   Use note: 1. Start your hole diagonally、 make a round trace and then hold drill straight. 2. Always use lubrication (water)、 otherwise the diamond core drill will burn.   Package Included: 1Set x Diamond Hole Saw (10pcs)   More Details: