apex ecomm Marble Hole Saw,2Pcs 20mm Diamond Drill Diamond Hole Saw Kit Diamond Drill Bit High Capacity

With electroplated diamond, the drill bit creates high precision, smooth cuts with no broken edges. Smooth and exact finish for lowering incision resistance and drill pressure, increasing the sharpness, and effectiveness of water lubrication. Widely used for cutting accurate holes on glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, light stone and fiberglass. Not suitable for drilling tempered glass, plastic and wood. Can produce clean and accurate holes in minutes with little or no chipping. Zinc plating on the bits maximizes tool life with great resistance to corrosion, and for making holes on glass or ceramic and considerably extending drill bit life. packing : 1 pack of 2pcs