Features： 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 Adapter Material: Aluminum Alloy Application: For Thru Axle Hub Product Size: Centerlock Adapter Base: BCD: Approx.44mm/1.7in, Full Length: Approx.52mm/2.0in Locking Cap: Inside Diameter: Approx.26mm/1.0in, Diameter: Approx.44mm/1.7in Weight: Approx.30g/1.1oz Package List： 1 x Centerlock Adapter Base 1 x Locking Cap