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 BMX hubs Type: Solid Axle Threads: 9.5mm x 24tpi Diameter: 9.5mm Length: 180mm 1 axle per bag