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 Features

• 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