Description: _x000D_ 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. _x000D_ _x000D_ _x000D_ Feature: _x000D_ Paint on the body of this bit avoids getting rusty. _x000D_ Opening neat and smooth, no broken edges, no shaking and chip easily. _x000D_ Small incision resistance, drilling stably and will not break the border. _x000D_ Mainly used for drilling ceramic tile, marble, granite, concrete and other hard material. _x000D_ Ideal for drilling the faucet mounting holes in stone counter top. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Color: Gold _x000D_ Size (optional): _x000D_ 6/8/10/14/16/18/20/22/25/30/35/50mm _x000D_ 0.24/0.31/0.39/0.55/0.63/0.71/0.79/0.87/0.98/1.18/1.37/1.96inch _x000D_ Quantity: 1 _x000D_ Size(mm) 6 8 10 14 16 18 20 22 25 30 35 50 _x000D_ Shank Diameter(mm) 5-11 _x000D_ Weight(g) 11 21 40 35 47 57 63 70 72 96 122 227 _x000D_ _x000D_ _x000D_ Instruction: _x000D_ 1, To prolong its using life, better to use with water for cooling and lubrication. _x000D_ 2, The hole drill bit can be used with bench drill, hand electric drill. _x000D_ 3, When you using hand electric drill, start slowly at 45 degree angle and go vertical after you make an initial mark. _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Diamond Drill Bit _x000D_ _x000D_ _x000D_ Note:_x000D_ 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding._x000D_ 2. There are two types of shank in different diameters and we will send in random. Please take the real one as standard.