Heavy Duty F Clamp with Fast Action Sliding/Locking Arm and Solid Rubber Grip Handle For Extra Torque (19" HD F-Clamp) Much quicker than using a good old C clamp, this heavy duty F clamp is truthfully unequalled in performance and reliability. Each clamp has a fast action sliding arm that features a profiled rail that not only minimizes flexing when clamping but helps the sliding arm to move freely. With a lever action locking mechanism, the clamp will hold just about anything and with just the right amount of pressure without marring your workpiece. The hardened, solid rubber handle provides a comfortable grip while still allowing for a tight hand grip. This allows you to torque the handle with extra force when necessary. The clamps are corrugated for even more strength and the clamp is powder coated to protect against everyday elements and corrosion. The jaw depth is approximately 4 to clamp most any type of workshop material. Available in 7, 11 and 19 lengths (length denotes distance between jaws).