This is a replacement 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 Trailer Bolts. Typically a 1/2" diameter Leaf Spring Mounting Bolts is used to attach the leaf spring to the hanger. Magic Tilt part # PK1701. This hanger can be used with both Double Eye and Slipper style leaf springs.