Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts.
Fits Atom®, Regina®, splined Zeus®, and some Schwinn®-approved freewheels
The FR-4 has 20 splines and is approximately 21.6mm in diameter
Always use a skewer or axle nut to hold remover firmly in place