Park Tool FR-6 Freewheel Remover Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts. The FR-5 has 12 splines that are approximately 23. 4mm across. Features Removes four-notch BMX / single-speed freewheel from hubs with 1. 37 x 24 TPI threads The FR-6 has four notches approximately 32mm across measured inside to inside and 40mm outside to outside Fits over axles up to 16mm thread diameter Always hold the remover secure to the hub using axle nut or quick release skewer Related Articles: CASSETTE AND FREEWHEEL REMOVAL AND INSTALLATION Manufacturer's Part No: FR-6 UPC: 763477003508 | Park Tool | Fr-6 Fr-6 Freewheel Remover: Bmx