Moving the handle 45 degrees pushes the clamping jaw forward. These side clamps have a moving jaw which moves forward and slightly downward for secure workholding. Moving the handle 45 degrees pushes the clamping jaw forward 2 mm. When releasing the clamp, the jaws move back for easy insertion and removal of the workpiece. The 150 series provides up to 670 lbs of clamping force and the 200 series provides up to 890 lbs of clamping force. User can make custom jaws to fit the application. These clamps work very well for repetitive clamping operations. Made from alloy steel with a black oxide finish.