The FR-1.3 is designed to fit the most common tool fitting found on 5-to-10 speed bicycle freewheel systems, including many models made by Shimano(R), Sachs Aris(R), SunRace(R), Dimension(R), and DNP Epoch(TM). Features an enlarged thru-hole to accommodate 14 mm solid axles. The 1" hexagonal base can be used in conjunction with a 1" socket or adjustable wrench. Heat-treated alloy tool steel construction for a lifetime of use. FR-1.3 Features - Fits 12-spline tool fittings with an approximate outer diameter of 22.6 mm - Center bore for axle clearance is 15 mm - 1" hexagonal base can be used with 1" socket or wrench