This 129 piece 5/16 18 thread jig and fixture hardware kit will give you most everything you need to make your own custom clamping and holding jigs. This will save you money by buying in bulk and eliminate trips to the hardware store. Kit includes: 1) 16 each solid brass threaded inserts 2) 26 each t nuts 3) 20 each brass plated 1 3/4" T bolts 4) 20 each brass plated 2 ¼" T bolts 5) 10 each brass plated 3 ½" T bolts 6) 6 each 2" T knobs with threaded through insert 7) 10 each 1" round knobs with threaded through insert 8) 4 each 2 " 5 star knobs with threaded through insert 9) 6 each 1 ½" 4 star knobs with threaded insert 10) 6 each 1 ½" 4 star knobs with 1" post 11) 4 each 2" 5 star knob with 1 ½" post. Comes in handy storage case.