The CP Wristpin listed is a .591" diameter by 2.000" length piston pin with a .140" wall, made from 5100-series Chromoly and chamfered for wire-lock retention. Provided dimensions and material indicate a high-strength pin intended for precise piston-to-connecting-rod interface in compatible engine builds where those bore and pin dimensions are required.
CP Wristpin .591in Dia x 2.000in Length .140in Wall 5100 Chromoly Chamfered For Wire Lock