The part number CROSBY H3315/16 refers to a Crosby G-3315 series forged snap hook in either the 7/16-inch or 9/16-inch trade size, featuring a reverse-eye style pattern commonly designated with an "H" or "G" prefix depending on the distributor catalog. It is a heavy-duty, spring-loaded industrial fastener manufactured from quenched and tempered forged carbon steel and finished with a galvanized coating.