This replacement raw steel weld on rear spring hanger is perfect for utility trailers or Boat trailers using 9/16 inch leaf spring bolts. This rear hanger welds to the frame of your trailer to attach your double eye springs. This hanger can only be used on single axle trailers as the rear hanger. The springs are attached to this hanger using two spring shackles (not Included) that are bolted on the outside of the spring hanger. This hanger is for use with a spring that is 1 ¾ inch wide. The bolt hole is for a 9/16 inch bolt.