Woodhaven 5760 1/4-20 Oval Nuts -20 Oval Nuts, pack of 10. Use these to attach accessories to our aluminum tracks, or attach tracks to tables, fences and more. Woodhaven Ultra Track, Double Track & One Track (plus many other makes of aluminum tracks) have T-Slots that will accept these zinc plated Oval Nuts that measure approximately 7/16" wide by about 1" long.