1.90pcs Diamond Burrs - Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing; Work on glass, metal , stone, ceramic, wood, plastic 2.Assorted shapes and sizes include: ball, cone, rounded cylinder, flat top cylinder, tapered & needle point. All burrs with a 3/32" shank - compatible with most die grinders or rotary tools 3.Different Sharp Bits Accessories - 30 Style different sharp router bit can reach More Carving, Great for all types of detail work. 4.Wide Usage - 3/32" 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 5.Quantity:30 pc variety of bits per box, come with 3 boxes , total 90 bits Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing Work on glass, metal , stone, ceramic, wood, plastic All burrs with a diameter 3/32 inch shank - compatible with most die grinders or rotary tools Total 90 Pieces in 3boxes 2.35MM（Suitable for all 2.35MM size grinding heads, reducing drills, carving knives, etc.）