Features： 1、Aluminum Material: Made of high quality aluminum alloy with high strength, rust resistance and durability, no easy to deform. 2、CNC Machining: CNC machining treatment can make the surface smooth, and can also prevent wear and tear. 3、Size Situation: The inner diameter of locking cap is about 26mm/1.0in, outer diameter is about 44mm/1.7in. 4、Universal Type: Can be used for barrel shaft, compatible with mountain bike, very easy to install and remove with the quick release whelset type. 5、Using Method: Using with centerlock adapter, mount on the middle lock hub, 9/12/15/20mm axis are all available, so that it can install 6 bolt disc. Specification： Item Type: Centerlock Lockring Material: Aluminum Alloy Application: For Thru Axle Hub, Bike, Mountain Bike Product Size: Approx.ID: 26mm/1.0in OD: 44mm/1.7in Weight: Approx.11g/0.4oz Package List： 1 x Centerlock Lockring