Product Description Sprocket work made easy: the FR-4 Cassette Remover by ParkTool Hardened steel cassette remover with solid 1" base for removal lever or vice. The thin-walled design allows use without first removing the cone or lock nut. Compatibility:Atom freewheelsRegina freewheelsZeus freewheelsSchwinn freewheelsFeatures:20 slots21.6 mm diameterManufacturer Number: FR-4 Contents:1 x Manufacturer: Park Tool Company 1185 Eagle Lake Rd Shoreview MN 55126 USA info@parktool.com Distributor: GROFA Action Sports GmbH Otto-Hahn-Straße 17 65520 Bad Camberg Germany info@grofa.com