ITEM NAME:Hub Disc Brake Rotor Adapter 6 Bolt Holes Bicycle Freewheel Threaded Hubs Description: - Made of alloy material,lightweight and durable. - Exquisite workmanship, feeling fine, easy to use. - Unique thread design, effectively and directly to make bicycle braking. - Hole centre distance: approx. 48mm/1.9inch - Thickness: approx. 7.5mm/0.3inch Package Included: 1 Piece Threaded Hubs Disk Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!.1 Piece Threaded Hubs Disk. - Unique thread design, effectively and directly to make bicycle braking. Color may be slightly different since different monitor.