As a handlebar riser for comfortable riding; Made of aluminum alloy, structured, solid and durable; Wide compatibility to fit carbon, alloy and steel forks; Concealed mount design combines practicality and aesthetics; Available in one size (55mm) to meet personal preference; Lightweight, quick and easy to install; Fits fork riser with outer diameter 28.5mm and inner diameter 23.3mm; Compatible with carbon fiber, aluminum alloy or steel steerer tubes; Screw hole: M5, compatible with M5 bolts (bolts not included); Installation requires M6 hex key (tool not included); Color: black + silver; Material: aluminum alloy; Dimensions: 160 x 23mm; Package includes: 1 x bike handlebar riser; Note: Due to lighting and display differences, the actual color may vary slightly from the image; Measurement error allowance is +/- 1-3cm.