The Similar to Bridgeport 951 Malleable Iron 1" Beam Clamp is a square-shaped fastener made of durable malleable iron, suitable for use with 1/4" threaded rods or bolts. With a zinc plated finish, this clamp features an open end design and a grip range of .75 inches. The mandrel material is steel, and the head style is also square-shaped, providing a reliable and secure fastening solution. Perfect for industrial and business applications, this product is a high-quality option for various fastening needs.