The Specialized Comp Multi Stem 31.8 is compatible with road and MTB composite handlebars. This Specialized multi stem is ideal for optimising your efficiency and comfort by fine-tuning your stem angle with this adjustable and economical stem. The bike stem uses 6061 aluminium material making it very strong and durable. Specialized Comp Multi Stem Features 3D-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 "