Simpson Strong-Tie offers a full range of anchoring and fastening products designed to maximize jobsite productivity and operator comfort. These products are tested in the field to meet the most demanding needs and to ensure quality and performance. The PHD pin is a 1/4-in. headed fastener with a 3/8-in. diameter metal washer. This pin is for use with the Simpson Strong-Tie® PHT-38 manual hammer tool as well as other hammer-drive tools.