The FR-1.3 features works with 12-spline freewheel designs with a 22.6mm diameter. It works with Shimano, Sachs Aris, Sun Race, DNP Epoch and other 5-10 speed freewheels. The hexagonal interface can be used with 1 inch wrenches or tools, as well as adjustable wrenches. The tool steel is of high quality, with precision splines and built for every day shop use. Every shop mechanic has to have an FR-1.3 on hand, and many serious home mechanics will opt to have one as well. You never know what bikes the neighbors may need help with. Park Tool gives you the affordable, shop quality tools for every job, even those that involve old school, thread-on freewheels. Features: Updated version of the Park FR-1 thread-on freewheel removal tool Longer shaft and enlarged thru-hole for 14mm axle designs 12 spline tool with 22.6mm diameter interface Compatible with most 5-10 thread-on free wheels Designed for: Shimano, Sachs Aris, Sun Race, DNP Epoch Hexagonal interface for 1" wrench or tool, can be used with adjustable wrench New design compatible with many e-bikes that use thread-on freewheels