Bolt Assembly, For Slot Width 0.4 in, Cast Iron, Zinc-Plated, Fastener Thread Size 5/16 In. -18, Fastener Thread Length 11/16 in, T-Nut, Flanged Button Head Socket Cap, Threaded Hole Location Single Offset, Slide-In, Inch, Compatible Brand and Series 80/20, 15 Series, 15 Series