Feature:1. Aluminum Material: Made of high quality aluminum alloy, high strength, rust resistant and durable, no deformation.2. CNC Machining: CNC machining treatment can make the surface smooth and prevents wear and tear.3. Size Description: The BCD distance of the centerlock adapter base id approx.44mm/1.7in, full length is 52mm/2.0in; Locking cap ID is about 26mm/1.0in, diameter is about 44mm/1.7in.4. Mountain Bike Available: Can be used for thru axle hub, compatible with mountain bike, very easy to install and remove.5. Using Purpose: mount on the middle lock hub, (9/12/15/20mm) axis can be installed, so that it can install 6 bolt disc.Specification:Item Type: Centerlock AdapterMaterial: Aluminum AlloyApplication: For Thru Axle HubProduct Size: Centerlock Adapter Base: BCD: Approx.44mm/1.7in, Full Length: Approx.52mm/2.0inLocking Cap: Inside Diameter: Approx.26mm/1.0in, Diameter: Approx.44mm/1.7inWeight: Approx.30g/1.1oz.Package List:1 x Centerlock Adapter Base1 x Locking Cap