Function: A comprehensive selection of hardware perfect for your creating your own t-track woodworking jigs and fixtures T-Bolts: (20) 1 in. / (20) 1-1/2 in. / (10) 2-1/2 in. / (10) 3-1/2 in. t-bolts - all precision machined of zinc plated hardened steel with 5/16-18 threads Knobs: (6) 2 in. t-shaped knobs / (4) 5-star insert knobs / (4) 5-star bolt knobs / (6) 4-star insert knobs / (6) 4-star bolt knobs / (10) 1 in. round knobs – all constructed of premium black, hardened plastic with threaded through inserts Threaded Inserts: (16) 5/16"-18 threaded inserts / (16) t-nuts Convenient Storage: (1) Plastic sorting case with assorted and movable dividers for quick access and easy hardware organization