Trebol 3 Cranks style: RHD (right-hand drive) / LHD (left-hand drive) compatible material: 4130 chromoly spindle: 19mm hollow chromoly spindle | 8 spline spindle bolts: 8x1mm (2) arm length: 175mm color: black additional inflat formation: "D" shaped arms to help prevent bending includes mid bottom bracket bearings