The straight line action toggle clamps design uses a straight-line or push/pull, Toggle clamping action. The push/pull handle is easy to operate & moves the plunge of the clamp in and out along its axis. Most of these clamps can be locked in two positio, allowing you to use them as either push or pull clamps. These clamps are manufactured in a variety of models to accommodate a wide range of load ratings.(45 kgs - 4,500 kgs)