working demands. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing; Work on glass, metal , stone, ceramic, wood, plastic. 6pcs Sanding Rings -- 6pcs various grits sanding ring (1000/1500/2000/3000/5000/7000), from fine to coarse, the more grit it features, the finer surface can be polishing. Coarse can use to do quick deburr. Wide Usage -- 2.35mm(3/32in) 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 ,Able to engrave on a wide range of materials including: wood, ABS, acrylic, PVC, plastics, etc. Well-suited for detailed work, such as building and sanding dollhouse furniture, model trains, or miniature buildings,Highly recommended for jewer. Sold Storage Box -- Specially designed label classification wooden box, use for identify easy diamond burr size and using type, easy to store and using. Premium Qality -- Different from other slightly coated diamond grinding head, outr rotary tool accessories are durable and diamond coat is thick and evenly, long lasting use. Maintian Tips: 1. Rotate speed as high as possible, usually required speed over 10-20m/s 2. Please operating with water to prolong the diamond burr heads' service life 3. After install in carving/rotary/engraving tool, before use please test if they are firmly assembeled 4. As drilling please keep stable in case shape working broken rotary bits Specification Quantity: 86pcs 12 Types Diamond Burr Bits: A/B/C2/C3/C7/D/E/F/G/H/K/Q Diamond Burr Bits Shank: 2.35mm #xff08;3/32inch #xff09; Sanding Ring Grit: 1000/1500/2000/3000/5000/7000 Sanding Ring Shank: 3.0mm Minimum Speed: gt;10-20 m/s Packing List: 80 * Diamond Burr Bits 6 * Sanding Ring 1 * Wood Storage Case