1Paint on the body of this bit avoids getting rusty 2Opening neat and smooth, no broken edges, no shaking and chip easily 3Small incision resistance, drilling stably and will not break the border 4Mainly used for drilling ceramic tile, marble, granite, concrete and other hard material 5Ideal for drilling the faucet mounting holes in stone counter top Description: These drill bits are cutting tools used to remove material to create holes of circular cross-section.There are many sizes for your choice and can create different kinds of holes in many different materials. Attached to a drill which powers them to cut through the workpiece by rotation. Feature: Paint on the body of this bit avoids getting rusty. Opening neat and smooth, no broken edges, no shaking and chip easily. Small incision resistance, drilling stably and will not break the border. Mainly used for drilling ceramic tile, marble, granite, concrete and other hard material. Ideal for drilling the faucet mounting holes in stone counter top. Specifications: Color: Gold Size (optional): 6/8/10/14/16/18/20/22/25/30/35/50mm 0.24/0.31/0.39/0.55/0.63/0.71/0.79/0.87/0.98/1.18/1.37/1.96inch Quantity: 1 Size(mm) 6 8 10 14 16 18 20 22 25 30 35 50 Shank Diameter(mm) 5-11