Bolts have an internal thread, 7/16" -20, on one end for use with bolt-on and swiveler spring cups. Fine thread bolts have 1-1/8" -12 outer threads, while coarse thread bolts are 1"-8. Available in steel or aluminum. ALL56066 8" Steel, 3/4" Hex Wrench, Coarse Thread 1"-8 Jack Bolt ALL56067 11" Steel, 3/4" Hex Wrench, Coarse Thread 1"-8 Jack Bolt ALL56090 6" Alum., 1/2" Drive, Fine Thread 1-1/8"-12 Jack Bolt ALL56091 8" Alum., 1/2" Drive, Fine Thread 1-1/8"-12 Jack Bolt ALL56092 6" Steel, 1/2" Drive, Fine Thread 1-1/8"-12 Jack Bolt ALL56093 8" Steel, 1/2" Drive, Fine Thread 1-1/8"-12 Jack Bolt ALL56094 4" Steel, 3/4" Hex Wrench, Coarse Thread 1"-8 Jack Bolt ALL56095 6" Steel, 3/4" Hex Wrench, Coarse Thread 1"-8 Jack Bolt