Introducing the Universal T-Track 48-Inch Woodworking Kit by POWERTEC. This all-inclusive combo features a 4ft aluminum alloy t-track and a convenient assortment of specially selected 5/16" -18 knobs and t-bolts. Perfect for jig/fixture building, this t-track kit works exceptionally well with most woodworking applications and other fabrications. With its unique double-cut profile design, this ultra-versatile woodworking assortment allows you to utilize all the hardware that you already have, as well as easily adapting to the newer hardware. To further enhance it's capabilities, you can pair it with a set of hold-down clamps (not included) and/or other hold-down accessories. Premium Design and Build: The t-track features pre-drilled holes (mounting hardware not included) and is made with high quality aluminum and gives you optimal durability with rust and corrosion resistance.