Shadow Finest Cranks style: RHD (right-hand drive) / LHD (left-hand drive) compatible material: 4130 chromoly with oversize welds | 1-piece CNC spindle bosses | Post weld heat treatment spindle: 22mm | 48-spline | hollow chromoly spindle bolts: 15x1mm Hollow Flush Mount (2) arm length: 165mm color: black additional information: flush mount use 8mm allen key 10x1.5mm (1) sprocket bolt designed with flat sides to be ankle friendly rounded top is ideal for crank slides minimal crank offset to keep your feet more centered for better control