Professional Wheel Hub Grinder Kit Rust Grinding Cleaning Rotor Rim Surface 1/2'' Brake Hub Cleaning Discs Wheel Hub Grinder Resurfacing Cleaning Kit 150mm for Cordless/ Air Drill. Features: Effective Cleaning Efficiency, Sturdy Grinding Discs, Versatile Corrosion Removal, Sturdy Composite Construction, Compatible with Cordless and Pneumatic Drills. Specification: Origin: Mainland China, For use with power tools with 1/2" drive, Maximum RPM: 1500, Inner diameter: 90mm, Outer diameter: 150mm, Replaceable silicon carbide disc, Product size: Approx. 150.00x150.00x150.00mm/5.91x5.91x5.91inch, DIY use scenario: Painter, Material: Plastic