The Shimano M810 Saint HollowTech II Bottom Bracket comes as a set that includes left and right hand cups, spacer, inner cover and inner O-rings. Length of screw thread is increased to enable the fitment of chain devices. Shimano M810 Saint HollowTech II Bottom Bracket Features Light weight seal structure helps to remove vital grams Sealed cups keep out dirt and water Maintenance free Compatible with 83 mm shells Durable gold anodised finish Easy installation