The Kupo 9" steel spring a clamp is one of the most useful tools on film or photo set. The spring clamp is also known as an a clamp. Constructed from solid steel withpvc coated handle and tips, features spring-operated pincers which allows a quick and easy mounting solution for many lightweight attachment needs. It is great for clipping a reflector or bounce card to a stand , or to keep a roll of seamless paper from unrolling.