SIZE: Quill shaft diameter:22.2mm/0.87 inch; clamp diameter: 25.4mm/1 inch for handlebar barbore, Length: 160mm/6.3 inch) MATERIAL:Aluminium alloy head and tube ,weight:0.66LB.It has enough hardness, will not rust, and the weight is not heavy, reducing the weight of your bike SUITS FOR:Fixed gear, Commuter bicycle，beach bike, etc; COLOR: Black,suitable for the black handleba of the bicycle,or you could choose according to your preference Please measure the diameter of where the stem is installed on the handlebar before purchase. WEEROCK Bike Stem 25.4 * 22.2mm（1 * 0.87 Inch） Aluminum Alloy Gooseneck Shape Length 160mm(6.3 Inch) Bicycle Stem,Black