★ Material: AL6061 ★ Clamp diameter: 25.4/31.8mm ★ Steerer diameter: 28.6mm(1-1/8”) ★ Extension: 50/60/70/80/90/100/110/120/130mm ★ Rise: 5 degree ★ Stack Height: 38mm ★ Bolts: Stainless steel*6 ★ Full CNC machined& Sand Blasted with anodized finish.