material: 6061-T6 aluminum hubshell | Hollow heat-treated chromoly axle | Chromoly 3/8 inch bolts
axle size: 15mm hollow center axle with 3/8 inch bolts
spoke holes: 36H
bearings: 2 durable sealed cartridges

additional information:
3/8"x24tpi axle bolts use 17mm Socket and 6mm Allen