With simple structure and great material, the grinding wheel drill bit has good sharpening effect, saving much effort. Great for fast drilling, tapping,etc. And Fast replacement composite cone, uses drill edged principle. Improve the utilization of drill bits, solve the troubles you have been buying drill bits, save time and save money._x000D__x000D_Features_x000D__x000D_- Color: Assorted Color._x000D_- Material: Brown corundum grinding wheel._x000D_- Size: 18.00X9.00X3.00cm/7.07X3.54X1.18in._x000D_- With simple structure and great material, the grinding wheel drill bit has good sharpening effect, saving much effort._x000D_- Great for fast drilling, tapping,etc. And Fast replacement composite cone, uses drill edged principle._x000D_- Forget the days of trying to find the correct angle by hand or accidentally tapering the of your tools._x000D_- Improve the utilization of drill bits, solve the troubles you have been buying drill bits, save time and save money._x000D_- Adopted from material, it is durable and long lasting use.Packing list:2 sets x drill bit sharpeners