Made of 7075-T6 aluminum, these super-stiff 20mm axles are hollowed out for weight savings and feature two CNC Machined 7075-T6 aluminum nuts to ensure proper fit and dropout overlap. Available for front or rear, they also fit most 20mm hubs on the market, including our Box One Quantum hubs. These are the same axles included with the 20-millimeter Hollow hubset.