Function: A comprehensive selection of hardware perfect for your creating your own t-track woodworking jigs and fixtures T-Bolts: (6) 1 in. / (6) 1-1/2 in. / (6)2-1/2 in. t-bolts - all precision machined of zinc plated hardened steel with 1/4-20 threads Knobs: (4) 5-star insert knobs / (4) 4-star bolt knobs / (4) 2 in. T-shaped knobs – all constructed of premium black, hardened plastic with threaded through inserts Threaded Inserts: (8) 1/4"-20 Threaded inserts / (8) T-nuts Convenient Storage: (1) Plastic sorting case with assorted and movable dividers for quick access and easy hardware organization