SmallRig HawkLock H21 Quick Release Magic Arm with Ball Head SR4488 (4488) SmallRig HawkLock H21 Quick Release Magic Arm with Ball Head 4488 is a compact and lightweight gadget with an exclusive patented quick-release slider slot. It also features roll pins positioning technology with a self-locking system that enables vertical locking and can bear loads up to 5.5kg / 12.2 lbs. With a 20mm / 0.8in ball head and 1/4-20 screws featuring detachable locating pins at both ends this ball head when used with SmallRig camera cages 4119B 3084C 4088B and monitors with similar locating hole specifications effectively prevents equipment deviation ensuring the safety of the equipment. The thumb lever on the ball allows for extension adjustment making it easy to adjust to the desired angle. With slots at both ends of the ball head thumb lever the adjustment range of the ball head is effectively increased allowing for flexible positioning of the equipment as needed.