1.10 Pcs tungsten carbide burr set 1/4" shank, head dia 6mm, 8mm and 10mm, 1 pc clamshell slotted plastic clear box(4"x3.2"x0.6"), 1 manual and 1 paper box. 2.Very sharp, aggressive, tough, well-balanced and durable, perfect for tight spaces than grinding discs grind wheel. Double cut produces a finer finish than single cut and reduces the size of the chips. 3.1/4 inch (6.35mm) shank compatible with DeWALT, Ingersoll Rand, Milwaukee, Makita die grinder, electric or air rotary tools. Great for lots of materials removal. Not fit 6mm collect of rotary tools. 4.Versatile: carving, chamfering, cleaning, contouring, cutting, deburring, elongating, engraving, grinding, meatalworking, milling, MRO, polishing, porting, sculpting, shaping, shaving, tooling, trimming, metal, wood, stone, steel, concrete, welds and plastic, etc.