As stem height extender to handlebar for comfortable riding;Made of aluminum alloy, well-structured, solid and ;Wide use scope to fit carbon, alloy and steel forks;Concealed mount to combine both practical & aesthetic features;Comes with 1 types ( 55mm) to meet personal preference.Light weight, quick and easy install.Applicable: Fork riser outer Dia. 28.5mm, Inner Dia. 23.3mmFits: Carbon fiber, aluminum alloy or steel pipesScrew Hole: M5, Stem M5 bolts can be directly engaged (Bolt not included)Tool: mount with M6 Hex key (Tool not included)Colour:black+silverMaterial:aluminum alloySize:160 x 23mmPackage Contents:1 x bike toolOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.