Spoke holes: 36hAxle type: 3/8" (10mm)x24tpi crmo female boltsMaterial: 6061-T6 aluminum hub shellBearings: fully sealedExtra info: 3/8"" female bolts with 17mm wrench flats and 6mm allen key, lightweight design, strong low flange hub, allen key inner axle for easy maintenanceWeight (kg): 0.281Color: black, gold, oilslick, high polished