Minerallac® Beam Clamp, 1/2 to 3/4 in Conduit, 5/16 to 1/2 in Flange Width, Hammer-On Mounting, 75 lb Load, For Use With: 5/16 to 1/2 in Flange and 1/2 to 3/4 in EMT/Rigid Conduits, Specifications: 2-Hole, Black, 1/4-20 Fastening-Hole, 0.042 in THK, 0.035 in THK Conduit Clip, Spring Steel, Zinc Phosphate/Oil, 3.31 x 2.16 x 1.4 in Dimensions