Features 1、CARBIDE BURR SET: These carving bits are made from tungsten carbide steel for long life, sturdy and stable. Shank diameter is 1/8in, cutting diameter for 1/4in. 1/8in shank fit most small rotary tools with three jaw chuck 2、DOUBLE CUTTING DESIGN: The grooves of these carbide rotating burr heads are crossed and the target surface is smooth after carving or engraving, so that even a variety of high accuracy molds can be machined, ideal for fine detail work 3、PRACTICAL AND VERSATILE: This rotary burr kit include everything you need to carve, drill, engrave, polish and remove incisive edges for wood, plastic, aluminum, stone carving, metalworking and mold grinders 4、WIDE APPLICATION: Carbide double cut carving burr bits include a large selection of shape options, suitable for all types of cuts, provide great convenience for your work 5、WIDE ADAPTABILITY: These cemented carbide burrs are often used with handheld electric or pneumatic tool drives(can also be used on machine tools). The speed of electric or pneumatic tools is usually 6000‑50000 revolutions per minute Specification Item Type: Tungsten Carbide Carving Bits Material: Tungsten steel Shank Size: 1/8in Package List 20 x Carving Bits 2 x Storage Boxes