This Dremel SpeedClic metal cutting disc is suitable for use on metal. It's compatible with use with sc402 mandrel and Dremel rotary tools. These quality SC409 fiberglass reinforced cutting wheels are just 0.75 mm thick - perfect for ultimate cutting precision. Features and Benefits: Quick and efficient cutting performance, Easy to use with a keyless design. Typical Applications: Perfect for precise cutting in all sorts of metals. Notes: Shank diameter: 3.2 mm, Working diameter: 38 mm, Max working depth: 14 mm, Maximum RPM: 35,000 1/min.