The Jorgensen Steel F Clamps are built for serious strength. They feature cast-iron heads, a high-carbon steel bar with 80,000 psi tensile strength, and a reliable multiple-disc clutch for powerful, secure clamping. Available in light-, medium-, and heavy-duty models, plus Deep-Reach versions with 5″, 7″, and 9″ throat depths — ideal for woodworking, cabinetry, and welding.