Rotary File Set Rotary Tool Accessory Type Rotary Rasp Bit Material Alloy Steel Shape Beveled Pear Rounded Square Tapered Max Speed 2 500 RPM Shank Diameter 1/4 in Mount Type Mounted Overall Length 2 in Burr Diameter 1/2 in Head Length 1 in Head Width 1/2 in Material Application Bronze Iron Mild Steel Plastic Soft Metal Wood