1/4 Inch (6.35 mm) Shank compatible with rotary , , , , , , , , , . Incredibly durable, sharp and well balanced and cuts through metal, wood, stone and plastic like a hot knife cuts through butter. High Precision: For burr flutes. Variety of shape: Cylindrical, Ball Nose Cylindrical, Ball, Ball Nose Shaft. Ideal for cleaning holes, sharp edges, welds, slots and hard-to-reach areas. Comfortable: Work with less vibration and less noise. of carbide burrs Cutting Type: Double Cut Optimal Attachment Type: 1/4 inch (6.35 mm) Head Diameter: 6 mm, 8 mm and 10 mm, Head Length: 6.8 mm to 25 mm, Shank Diameter: 1/4 inch (6.35 mm), Total Length: 52 mm to 70 mm. Material Applications: Hardwood, Balsa, Wax, Soapstone, Slate, Marble, , Concrete, Steel, Hardened Steel, Solder, Stainless Steel, Brass, Copper, Bronze, Aluminum, Cast Iron, Cobalt, Nickel, Titanium, Zinc, Earthenware, Terracotta, Porcelain, Fiberglass, Plastic, Rubber, Fiber Reinforced Plastics, etc. Burr Applications: Carving,