Features 1、Made of chrome corundum sand, it can meet all grinding needs. It can also sharpen and remove hard materials. 2、Cylindrical shape, used for polishing and deburring the appearance of various objects, including curved and uneven appearances. 3、The hardness of chrome corundum is similar to that of white corundum, with high hardness, high toughness, sharper and more durable. 4、50 grinding wheel heads are packed in a sturdy, convenient, and resealable plastic storage box. 5、Grinding and polishing drill bits can be used with rotating tools such as electric grinders and hand drills for polishing, grinding, trimming, engraving, and deburring. It is suitable for molds, metals, plastics, wood, etc. Specification Item Type: Grinding Bits Material: PA Chrome Corundum Grinding Head Diameter: Approx. 3 x 12mm / 0.1 x 0.5in Shank Diameter: Approx. 3mm / 0.1in Package List 50 x Grinding Bits 1 x Plastic Box