Terrier FSV 4 Ton Screw Beam Lifting Clamp - 851700Terrier FSV 4 Ton Screw Beam Lifting Clamp Multi Use Clamp for Lifting, Rigging & Anchoring The Terrier FSV Screw Beam Clamp (Model 851700) is a heavy duty clamp rated for a 4 ton working load limit and built for lifting, pulling, or anchoring steel beams. With a secure screw lock mechanism and equal jaw movement, this clamp provides simple, fast attachment and versatile performance. Its individually proof tested to 2x the WLL and meets a 5x safety