Campbell Chain U-Head Shackle Screw Pin is made of steel and is zinc plated It is secured with a screw pin It has quick release locking pin mechanism The shackles can be used for connecting link for rigging systems The shackle body is designed with drop-forged carbon steel to keep it rust free The shackle is hot galvanized to meet the ASTM A-153 specifications It is durable and corrosion free The alloy made pins and bolts in the shackle are heat-treated for impact resistance and ductility