The Rock Solid Master Side Arm is designed to securely mount a Tether Table Aero, lights, cameras, and other gear to a C-Stand, railing, truss or other location. The Master Side Arm features two 5/8â³ (16mm) dual baby receptors, and two anti-rotation, multi-hex studs that pair perfectly with the Rock Solid Master Clamp (sold separately) to position gear in various spaces and angles.