Safety hook and body are formed from 7/8" dia steel pipe. Spring mechanism consists of 4-1/4"L compression spring fastened to 5/16" dia eyebolt. All metal parts permanently assembled using 20 tons of force. Large, insulating grip measures 5-1/8"L with 2-1/4" dia flange for extra shock protection. Molded of soft, flexible material that will not chip, crack or break when abused. Contains carbon black to deter UV rays. Metal parts are plated to resist rust.