TOSEEK Replacement Stem Bike Road Cycling MTB Mountain Bike Aluminium Alloy + Carbon Fiber Handlebar Stem, 31.8 60/70/80/90/100 / 110/120mm angle 6 and 17 (6 degree-70mm) Constructed of aluminum alloy and carbon fiber Exquisite workmanship Suitable for handlebar with diameter 31.8mm Four bolt bar clamp holds bar securely in position