This replacement bolt on 4 hole front spring hanger for boat trailers is made out of hot dipped galvanized steel. This hanger can be used as a front hanger on a single axle trailer. Also can be used as the front and rear hanger on a tandem axle. Simply bolts to the frame of your trailer using 3/8” bolts.  This spring hanger is used on 1 ¾” wide Double Eye spring.  The bolts to attach the double eye spring to this hanger would be a ½” bolt.