Optimise your efficiency and comfort by fine-tuning your stem angle with this adjustable and economical stem3D-forged and CNC-machined, 6061 aluminium, road/MTB-compatible stem,4-bolt oversized 31.8mm handlebar interface with relieved faceplate,Equipped with top cap and 4-degree, 2-degree, and 0-degree shims,Available in 12-degree, 17-degree, and 24-degree angles,12-degree: 10 position angle range: +/- 8-degree to 16-degree, in 2-degree increments,17-degree: 10 position angle range, +/- 13-degree to 21-degree, in 2-degree increments,24-degree: 10 position angle range: +/- 20-degree to 28-degree, in 2-degree increments,Compatible with composite handlebars.