A Must-Have: The tungsten carbide burrs set 1/4 shank is a great variety of shape. Package Includes: 10 PCS 1/4" shank carbide burr bits, 1 ten-slots inner plastic clamshell box, 1 outer plastic double buckle clamshell box, 1 ten-slots beech holder Long Life: Made of heat-treated solid tungsten carbide YG8 that lasts 8 times working life durability than HSS tool, suitable for machining various kinds of metal material including ≤HRC65 hardened steel Multi Purpose: Widely used for metalwork, tool making, engineering, model engineering, wood carving, jewellery making, welding, chamferring, casting, deburring, grinding, cylinder head porting and sculpting Wide Compatibility: 1/4 inch (6mm) shank compatible with DEWALT, Ingersoll Rand, Milwaukee, Makita, Chicago Pneumatic, angle or straight die grinder, electric or air rotary tools, etc. Great for lots of materials removal Good Quality: Double cut produces a finer finish than single cut and reduces the size of the chips and slivers. It also gives greater tool control. Can be processed into a variety of high-precision shape mold cavity Package Includes: 10 PCS 1/4" shank carbide burr bits, 1 ten-slots inner plastic clamshell box, 1 outer plastic double buckle clamshell box, 1 ten-slots beech holder