Kink Brace Cranks style: RHD (right-hand drive) / LHD (left-hand drive) compatible material: 100% 4130 Chromoly Steel | TruTherm Post Weld Heat Treated spindle: 22mm | 48-spline | hollow spindle bolts: 15x1mm (1), 3/8" ratchet and 6mm allen key broaches arm length: 160mm color: ed black additional information: traditional 3pc cranks oval tapered tubing gives the cranks a sleek look and a stiff feel large radiuses on the spindle bosses make these cranks more ankle friendly