Park Tool FR-1. 3 Freewheel Remover It's just about time you change out your worn out cassette and there's no better tool than the Park Tool FR-1. 3 Freewheel Remover to get the job done right. It is designed to be used with 12 splined cassette lock rings, specifically Shimano and other similar freewheels. It can also accomodate 14mm axles thanks to the enlarge thru-whole. Features 12 spline 22. 6mm diameter Fits Shimano(R), Sachs(R) Aris, Sun Race(R), DNP(R) Epoch and other 5 "10 speed freewheels. Includes enlarged thru-hole for 14mm axles Related Articles: CASSETTE AND FREEWHEEL REMOVAL AND INSTALLATION Manufacturer's Part No: FR-1. 3 UPC: 763477003447 | Park Tool | Fr-1. 3 Freewheel Remover Fr-1. 3, Freewheel Remover