12 splines, 22.6mm diameter fits Shimano®, Sachs® Aris, Sun Race®, DNP® Epoch and other 5–10 speed freewheels. The FR-1.3 includes an enlarged thru-hole to accommodate 14mm axles. Base of tool can be installed in a vise or used with a 1" socket or wrench.
Base size for socket or wrench is 1" or 25.4 mm
Always use a skewer or axle nut to hold tool firmly in place during removal