Its surface can be cleaned and restored to regain its original shape by using a dressing stone. Nail drill bits used for cleaning, sharpening, deburring, grinding, rust protection, etc. Metal grinding bits tools for processing various molds, carbide, glass, jade carving and others. Features - Color: Golden. - Material: Alloy. - Size: 3.40 x 1.50 x 1.50cm/ 1.34 x 0.59 x 0.59 inch. - The polished end of the drill bit is chrome-plated and hardened to improve performance, strength and durability, and prevent damage. - The standard grinding head is for shaping various types of glass, ceramic tiles, stone and similar materials. - Since the working position of the diamond grinding head always stays in place, the consumption is smaller and the service life is longer. - Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Work on glass, metal, stone, ceramic, wood, plastic.