Double Cut Burr Bit Carbide Rotary Die Grinder Engraving 1/4" Shank Tool Kit Set High working efficiency, perfect grinding effect and long using life. Give your rotary tool even more functionality with this set of diamond burrs. Convenient to grind, simple to use, safe and reliable. Machine parts bevel edge, inverted round and trench processing. Specifications: Product: Double Cut Burr Bit Color: Metallic Silver Material: Carbide Alloy Work-hardness: HRA 85 Type: Rotary Burr Groove: Double Rotary Shank diameter : 1/4" , (6mm) Total length: 1-49/64" - 2-9/16" , (45-65mm) Cutting Edge Diameter: D: Spherical D1 : 6mm / 1/4" , Length: 1-49/64" (45mm) D2 : 10mm / 25/64" , Length: 2-1/64" (51mm) C: Cylindrical ball head C1 : 6mm / 1/4" , Length: 2-13/64" (56mm) C2 : 10mm / 25/64" , Length: 2-7/16" (62mm) F: Curved round head F1 : 10mm / 25/64" , Length: 2-7/16" (62mm) F2: 12mm / 15/32" , Length: 2-9/16" (65mm) A: Cylinder shape A1 : 10mm / 25/64" , Length: 2-23/64" (60mm) A2: 12mm / 15/32" , Length: 2-7/16" (62mm) Features: Good processing quality, finish high, long service life. Can process a variety of high-precision mold cavity The carbide alloy rotary file use is extremely widespread, applies in the mold processing manufacture. Can be processed cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, and marble, jade, bone and other non-metallic. Reduces the arduous manual labor greatly, reduce the cost of production. The carbide alloy rotary file main supporting the use of electric tool or the use of electric tool or the pneumatic tool, may also install on machine tool Package Included: 1Set x (8pcs) Double Cut Burr Bit Carbide Rotary Die Grinder Engraving 1/4" Shank Tool Kit Set