You can use our aluminum T-slot tracks and our hold down clamps to build a wide variety of jigs, fixtures, and hold down devices. Our 5/16" deep x 3/4" wide T-slot track attaches with #6 wood screws. T-slot track accepts standard 1/4" x 20 hex bolts. (Wood screws and bolts are not included.) The hold down clamp assembly slides in the T-slot track. Each hold down clamp assembly includes an aluminum clamp head, wing knob, and 1/4" x 3" bolt. Wing knobs are also available separately.