Wake 31.8mm High-Strength Aluminium Alloy Bicycle Stem Road MTB Mountain Bike Stem Bicycle Parts Cycling Handlebar Stem&pound;&uml;red&pound; Constructed of high-strength CNC machined 6061 T6 aluminum alloy. Frosting finish, exquisite workmanship. Suitable for handlebar with diameter 31.8mm. Four bolt bar clamp holds bar securely in position. This handlebar stem is constructed of high-strength CNC machined 6061 T6 aluminum alloy.