WOODPECKERS SUPER TRACK is a, heavy-duty, general purpose T-Track for a variety of woodworking applications. Super Track has (7) “T” shaped tracks distributed around all four sides. These tracks fit any standard 1/4” fastener such as 1/4” hex nuts, hex head bolts and 7/16” wide oval nuts. In fact it's these vary tracks that make SUPER TRACK so easy to install. Simply drill holes in the work surface, drop in some 1/4-20 hex head bolts and slide in SUPER TRACK. Very simple, very easy. A big advantage bolting from the bottom has over screwing down from the top is resistance to pullout. Bolting from the bottom had dramatically greater resistance to pull out.