The SmallRig 5331 Double Head Crab-Shaped Clamp consists of a universal magic arm and two crab-shaped clamps for versatile mounting solutions. Each clamp features a 15-40mm (0.6-1.6in) clamping range with non-slip rubber pads, enabling secure mounting of various accessories such as reflective umbrellas, selfie sticks or microphones onto tubes, tables, tripod legs, or railings.