Engraving Bit Rotary Tool Accessory Type Engraving Bit Bit Material Alloy Steel Shape Ball Max Speed 35 000 RPM Shank Diameter 1/8 in Mount Type Mounted Overall Length 1 1/2 in Burr Diameter 1/16 in Head Length 1/16 in Head Width 1/16 in Material Application Plastic Soft Metal Wood Package Quantity 2