Palmgren's L-Clamps save time, labor, and increase productivity making them a perfect value. Just slide the clamping arm to the work piece and tighten. Whenthe job is complete, simply loosen the spindle and slide the clamping arm back. L-Clamps handle a wide variety or work sizes and shapes allowing you to clamp the work piece quicker while using fewer clamps on each job. A lifetime guarantee against breakage make these the perfect clamps for you.