Bicycle Bike Disc Brake Mount 20mm Post Adapter to 180mm Rotor for SRAM AVID Specifications: For front disc brake. For 180mm rotor. For post mount brake caliper. For PM mount fork. Aluminum alloy material, good compatibility. Item Name: Disc Brake Adapter Material: Aluminum Alloy Full Length: 8.5cm/3.35" (Approx.) Hole Distance: 7.5cm/2.95" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Disc Brake Adapter 2 x Screws 4 x Gaskets