HEADSET OR8 SEMI-INT/EXT CUP TWISTR 1-1/8 1.5 ZS44/28.6|EC44/40 BKFeatures-Highly polished sealed angular contact premium bearings ensure smooth operation-CNC machined AL6061 top cover is sealed to keep moisture and grit away from the bearings-CNC machined AL7075 crown race protects the lower bearings and fork-AL6061 top cap, forged stainless steel bolt, and star nutItem Specifications-Size:1-1/8` to 1.5`-Color:Black-SHIS:ZS44/28.6|EC44/40-Cup:44mm/44mm-Steerer OD:28.6mm-Race:40mm-Bearing Angle:45°/45°-Stack Height:13mm Top/13.7mm Bottom