"LEFT CRANK COTTERED" SC-CW-109 is a cottered left-hand bicycle crank arm, the arm that carries the left pedal and turns the bottom bracket axle. Its wide end has the axle hole with a cross hole for the cotter pin that locks the crank to the axle, and the narrow end has a pedal eye. The arm is straight with flat sides. Size is made to order. The finish is BCP or black powder coated. Part numbers: SC-CW-109