new Material: tungsten steel Diameter of cutting edge: about 6-12mm Stem Diameter: Approx. 6mm(1/4") Total length: approx. 45-65mm Groove: Double Rotary A: cylinder-shaped C: cylindrical spherical head D: spherical F: curved round head Usage: can only be side grinding, can not be back and forth grinding Features: The use of carbide alloy rotary file is extremely widespread, apply in mold processing manufacturing. Machine parts beveled edge, inverted round and trench processing. Can be processed into cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, and marble, jade, bone and other non-metals. Widely used in machinery, automobile, marine construction, chemical, craft carving, etc. Good processing quality, high workmanship, long service life. Can process a variety of high-precision mold cavities. Easy to grip, easy to use, safe and reliable. Greatly reduce the arduous manual labor, reduce the production cost. The carbide alloy rotary file supports the use of a power tool or the electric tool or the pneumatic tool (can also install on a machine tool) Package included: 8pcs x Burr Tips