4 Square Inch Beam Clamp. Cast bronze 4 square inch bonding plate with one 2-way bolt pressure cable holder. For primary bonding to beams and similar flat metal protrusions. Stainless steel bolts and washer. 3-1/4 x 2 in. (82.6x 50.8 mm); approximately 1 lb 1 oz. (482 g). Also available in tinned.