Safety hook and body formed as one from 7/8 in. diameter steel pipe. Spring mechanism consists of 4 1/4 in. long compression spring fastened to a 5/16 in. diameter eyebolt. All metal parts permanently assembled using 20 tons of force, no flimsy snap-on/push-on fasteners used anywhere. Performs in any climate, metal parts plated to resist rust, molded grip contains carbon black to deter UV rays.