Note: Please allow 1-2mm errors due to manual measurement 2 screws and 4 spacers are included. PM-A Adapter Specifications: Material: Aluminum alloy Colour：Black,Red,Gold,Blue,Titanium Length: approx. 102 mm Bolt Bolt distance: approx. 74mm Weight:approx. 43.2g This brake adapter is used to convert a 160 mm rotor to a 180/203 mm rotor Post Mount.Brand new and high quality.Fit Front&Rear 180/203mm Rptor. IS-B Adapter Specifications: Material: Aluminum alloy Colour：Black,Red Weight: approx. 36.9g Length: approx. 85 mm Bolt Bolt distance: approx. 74mm This brake adapter is used to convert a 160 mm rotor to a 180/203 mm rotor It will mount a 74mm post mount caliper a 74mm post mount fork or frame to accommodate a Front&Rear 180/203mm Rotor. Brand new and high quality.Fit Front 203/Rear.