Use an electric drill, wear-resistant corundum grinding wheel to improve the throughput of the drill bit. Simple and safe method of sharpening the drill bit, improves its working performance. The grinding wheel drill bit has a simple structure, excellent material, good grinding effect and labor saving. mainly used for grinding iron drill bits, other high hardness drill bits are not suitable. light and compact size, drill bit grinding tools are easy to carry. Characteristic : 1. Use electric drill, wear-resistant corundum grinding wheel to improve drilling rate. 2. Simple and safe method of sharpening the drill bit, improves its working performance. 3. The grinding wheel drill has simple structure, excellent material, good grinding effect and labor saving. 4. Mainly used for grinding iron drills, other high hardness drills are not suitable. 5. Lightweight and compact in size, drill grinding tools are easy to carry. Element type: Drill bit sharpener Material: Corundum wheel Color: Blue Product size: About. 2mm-5mm / 5 / 64in-13-64in, 5mm-8mm / 7 / 32in -21 / 64in, 8mm-12.5mm / 11 / 32in-1 / 2in Total length: About 170 mm / 6.69 inch Weight: Approx 175 g / 6.2 oz Function: A Quick and Easy Way to Sharpen Drill Bits Package List: 1 x drill sharpener 1 x plastic cap 2 x wrench tool and 2 x grinding wheel 3. After use, put it in a dry and clean place. Do not use with irritating chemicals, otherwise the service life may be shortened.