Adjust the angle, from -40 degrees all the way up to 90. Mountain bike aficionados know how much of a difference that makes. You can set it for quick handling and responsiveness, or power-pedaling for steep climbs. Hollow design light weight. Easy installation, just connect up the front fork stem. Four bolt bar clamp holds bar securely in position Constructed of high-strength material. Suitable for most road bike, mountain bikes, folding bike, track bike, , , , etc. Name:Adjustable Bike Stems Torque setting:10-12N.m Style:High intensity stem Weight:346g Colour:Black Material:aluminum alloy Size: Handlebar center diameter:31.8mm (1-1/4inch) Installation height:40mm Stereer tube diameter:28.6mm (1-1/8inch) Center distance length:95mm Total length:165mm Package Contents: 1 * adjustable bike stem Only 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.