BUCKLOS Center-Lock Adapter is Made of premium aluminum, corrosion resistant and rust-proof, strong and durable.Adopt CNC fine turning, make teeth bright and smooth without burr.Easy to install.Strong compatibility, Suit for Mount a 6 Rotors on a Wheel,Compatible with 12 mm /15mm/20mm Thru-Axle Hubs. Center Lock Adapter: Brand: BUCKLOS Color: Red, Blue, Black, Gold Material: Auminum alloy Dimensions: Spacer: 42*0.1mm, cover: 44.7*9.3mm weight: 31.