1. Piece of hardware used on a http://www.controlbooth.com/forums/glossary-l/8036-c-stand.html. Supaclamp - Grip Head 2. Slang for the male multi-cable connector on a PAR-Bar or Break-Out. On a PAR-Bar, the location of the knuckle determines whether the circuits go 1-6 or 6-1. On a breakout, the location of the knuckle is important to ensure that all the circuits will reach where they need to.