This revolutionary Stem features 3D adjustment, up and down, forwards and backwards and rotation, with just 1 quick-release lever. A single lever simultaneously controls both stem and bar so it takes only seconds to adjust your riding position. Riders of any size, whether they prefer a comfortable upright riding position or an aggressive performance position, will be able to find their preferred position. It features a tough wide design, making it one of the stiffest, strongest adjustable stem on the market. It also alllows you to rotate the handlebar 90 degrees to a set position for folding and return to the correct central position for riding. Technology that adapts to the rider, not the other way around. Providing the cams and moving parts are kept lubricated this is a very smooth and quick to operate system. Ideal for 26" wheel folding bikes Dahon or otherwise. It fits an OVERSIZE 28.6mm (very common size now) and not the earlier standard 25.4mm handlebar. The two loose caps press into the sides of the stem to cover the holes.