Use the electric drill Improve the use of the drill Wear-resistant corundum grinding wheel. perfect for punching, tapping, etc. And the replacement composite cone uses the principle of sharp drilling. Lightweight and compact, the drill bit sharpener is easy to carry. Made of high quality ABS plastic and brown corundum grinding wheel, it can grind the iron drill bit very well and is not easy to damage. Mainly used for grinding iron drill bits, other high hardness drill bits are not suitable. Specifications: Condition: New Color: Blue Material: ABS + metal Size: 170 x 85mm Package Contents: 3 x Blue Drill Bit Sharpener 3 x Wrench 12 x Grinding Wheels 3 x Clamp Spring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.