This is a heavy duty replacment  hot dipped galvanized leaf spring hanger for magic tilt trailers.  This 4 hole bolt on hanger is for use with 1 3/4" wide springs and is used as the front hanger on the trailer frame.  It attaches to the aluminum I-beam frame using 3/8" diameter bolts.  Typically a 1/2" diamter bolt is used to attach the leaf spring to the hanger.  Magic Tilt part # PK1703