Designed for hands-free holding of reflector boards, foam core, or flat surfaces up to 4" thick, the Plate Clamp Duckbill Style from Impact, sometimes called a platypus clamp, has a 7" vise-type jaw with a release lever in the handle that unlocks the clamp with a simple press. The clamp has a welded 5/8" "Baby" pin that gives it wide compatibility with grip gear and accessories with an industry-standard 5/8" receiver.