Wheels Mfg axles are made from aircraft quality 4130 alloy steel, made specifically for Wheels Mfg. It's heat-treated to increase strength without making the axle brittle. Rolled threads make for easy assembly of cones & locknuts. - Fits many Shimano / Japanese rear hubs with 126mm spacing - Type: Hollow Axle - Threads: 10mm x 1 - Diameter: 10mm - Length: 137mm - 1 axle per bag