The Big Horn 12620 149 Piece Universal T-Track & Jig Hardware Kit-1/4” -20 TPI has been designed to include all the components to create or customize t-track jigs and fixtures. Equipped with an assortment of stainless-steel nuts and t-bolts, screw on clamping knobs, and threaded inserts designed for 1/4” 20 TPI applications. This versatile combination has been divided by size and style in a clear-plastic case for easy organization and storage. The ideal kit to keep around your shop. Perfect for creating t-track and jig assemblies.