There’s a reason Jorgensen I‑bar clamps are our most popular heavy‑duty steel bar clamps. The special steel I‑bar design is tremendously strong and stiff, and the clamp head is fixed for maximum resilience. A cold‑drawn steel screw with smoothly cut acme threads attaches to ductile cast‑iron castings to complete the clamp. Depend on this clamp to withstand the rigorous daily demands of school shops, commercial woodworking operations, metalworking factories, welding applications, and serious woodworking applications.