192431 Knape & Vogt Mfg Co 82 BLK 48 48, Black, Dual Track Shelf Standard, Heavy Duty Steel, Ideal For Decorative, Utility Or Filtering Applications, 1Width, Slotted For 1-1/4 Adjustments, Stronger, Double Slotted Standards For Use With Only The 182 Series Brackets #82 Wood Screws, 14 Gauge Steel, Can Hold Up To 450 LB Per Pair.