Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts.FR-4 FeaturesFits Atom, Regina, splined Zeus, and some Schwinn-approved freewheelsThe FR-4 has 20 splines and is
Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts.
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