Bridgeport® Beam Clamp, Single Screw Insulator Support, 1/2-13 Rod, Threaded Mounting, 300 lb Load, Specifications: 2-1/2 in Trade Size, 1 in Maximum Jaw Opening, Malleable Iron, Electro-Plated Zinc, 2-1/2 in L x 2-1/2 in W x 2-1/8 in H Dimensions,