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.)