It will mount a 74mm post mount caliper to a 74mm post mount fork or frame to accommodate a Rear 203mm disc.Feature:Brand new and high quality.Fit to Rear 203mm disc.2 bolts and 4 washers are included.Specifications:Material: Aluminium alloyColor: BlackLength: approx. 85mmBolt to Bolt distance: approx. 74mmPackage Includes:1 X Disc Brake Adaptor2 X Bolts4 X Washers