EATON B-Line Series C-Clamp, Mechanical Beam Z-Purlin, Series: B3037, 3/8-16 Rod Diameter, 400 lb Load, For Use With: Attaching Hanger Rod to the Bottom Flange of a Z-Purlin, Specifications: 31/32 in Throat Opening, Malleable Iron, Zinc Plated, 3-13/32 in L x 3 in W Dimensions