ITEM NAME:Drill Bit Sharpener Corundum Grinding Wheel for Drill Polishing Grinder #gib Store Home Promotion Hot Item Add to Fav.2-12.5mm Portable Drill Bit Sharpener Corundum Grinding Wheel for Drill Polishing Grinder. Wear-resistant corundum grinding wheel. Material: ABS + corundum grinding wheel. At present, the grinding wheel of this product is brown corundum grinding wheel, so the product is mainly used for grinding iron drills, other high hardness drills are not suitable for use, the loss will be relatively large, and need to be used with electric drills.