Features: ?30 Pieces Diamond Burrs Set?Excellent for fine detail work, cutting, engraving, carving, -up and finishing; Work on glass, metal , stone, ceramic, wood, . ?Feature?Various grinding head shape: ball, cylinder, cone, needle etc, meet your different carving/engraving need. ?Shank Diameter?1/8" diameter shanks, compatible with most rotary tools; Ideal for home improvement, craft and whenever you need to polish, grind, drill, cut, engrave, and more,used with most rotary tools. ?Long Working Life? working life of these solid rotary burr is 10 times longer than high-speed steel and 200 times longer than grinding wheel. Specifications: Material: Metal Quantity: 30Pc Assortment Item Weight: 45 * 3mm / 1.77 * 0.12in Package Weight: 80g / 2.82oz Package Size: 14.5 * 6 * 2cm / 5.71 * 2.36 * 0.79in Package List: 30 * Diamond Burr Bits 1 * Storage Box