. It avoids the need to replace the hub when upgrading the front fork, which greatly saves money for enthusiasts . Aluminum alloy material, light weight and high strength . HMX 15MM barrel shaft conversion to 12MM barrel shaft, universal conversion bushing fits most bike hubs . seal design to the conversion seat, the hub is higher precision and stronger stability after installed . Can be used with the common 100x12MM road disc brake hub, which can be supported on the market Description: - HMX 15MM barrel shaft conversion to 12MM barrel shaft, universal conversion bushing fits most bike hubs - Aluminum alloy material, light weight and high strength - Can be used with the common 100x12MM road disc brake hub, which can be supported on the market - It avoids the need to replace the hub when upgrading the front fork, which greatly saves money for enthusiasts - seal design to the conversion seat, the hub is higher precision and stronger stability after installed Specification: - Material: Aluminum Alloy - Size: Approx. 30 x 15 mm / 1.18 x 0.6 inch - Color: Blue, Gold, Black, Red Package Includes: 2 Pieces Bike Front Hub Adapter (with Seal Rings) Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item. Thanks!