B-Line Channel Bracket, Series: B291, 1070 lb Load, 6 Holes, 18-1/2 in Length, 1-5/8 in Width, 6 in Depth, 7/32 in Thickness, 9/16 in Dia Hole, 5-1/4 in, 3-1/8 in, 7-3/4 in, 2-1/2 in Hole Spacing, Surface Mounting, For Use With: Channel, Steel, Electro-Plated Zinc