Made from ultra-strong Aluminum 7050 T7 alloy to reduce weight and designed with clamps that won't loosen no matter how hard you ride Rider insight driven 132? opposing steerer clamp bolts deliver optimal knee clearance, while maintaining alignment during tightening Highly machined with a two-tone anodized finish for high quality look as well as function 35 bar clamp diameter, 1-1/8" steerer clamp, 40 mm steerer clamp stack. STEM 50MM LENGTH PLUS EGG