These fast action clamps are exceptionally simple to use, as well as fast. Slide the movable piece up the bar and press down on the handle - it instantly ratchets into a locked position. When glue has dried, simply pull the trigger and the movable arm can be slipped down and the clamped parts removed. The movable arm slides smoothly up and down the shaft. The KliKlamp is durable, as well as speedy. Made in Germany.