Transform the head angle of your mountain bike with ease, with up to six offset angle adjustmentsSteeper or slacker adjustments from 0.5 to 1.5 degrees, make dialing in the perfect geometry to attack the trail a breeze7075 T-6 Aluminum, Internally contoured and relieved to minimize weight and maximize strengthLow-friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose partsInterlok spacer compatibleZS44/28.6|EC56/40Black28.644/56402836°/45°1-1/8 to 1.5`