"Vestil Beam Clamps are designed for use as a fixed-position lifting point for an overhead hoist. Distributes loads away from the flange edges to reduce I-beam flange stress during overhead lifting applications. Flange Width in. 4 1/2 to 8 1/2, Material Steel, Capacity Ton 3. Handles loads up to 6,000 lbs. Adjustable locking screw mechanism lets you quickly change the width for quick interchange from one gantry to another Fits beams with flange width from 4.5in.-8.5in. Convenient hoist hook attachment point is built in Durable steel construction with painted finish"