Bolts have 7/8"-9 thread and are available in a fixed or swivel end design. Fixed end bolts are 11" from center of eye to end of threads. Swivel end bolts are 11-3/4" from center of eye to end of threads and have a 1/2" square drive end for quick and easy adjustments. Choose 1-1/2" or 2" I.D. eye.