Superstrut®, A1202HS-20HDG, Metal Channel, Back to Back Combination Half Slotted, Series: A Series, 1-5/8 in Width, 1-5/8 in Depth, 20 ft Length, 12 ga Thickness, 9/16 x 1-1/8 in Slot, 2 in Slot Spacing, 3000 lb Load, Steel, Hot Dipped Galvanized, Domestic,