Power-Strut® Beam Clamp, Series: PS 2651, 1000 lb, For Use With: PS 200, PS 210, PS 300, PS 400, PS 500, PS 520 Channel, 9/16 in Hole, 13/16 in Hole Spacing From End, 1-7/8 in Hole Spacing On Center, ASTM B633, Type III SC1/SC3, Steel, Electro-Galvanized, 3-3/8 in H x 3 in W x 1/4 in THK