The Q-08 Professional Ball and Socket Head from Sinno provides the photographer with pan and tilt controls so that they can quickly and accurately position their camera. Although compact, this head is capable of handling a camera and lens combination weighing up to 25 lb and features an Arca-Swiss compatible quick release, and a quick release safety lock. A large knob is provided to lock the ball head, independently of the panning tension which can be regulated with its own thumbscrew. The ball head also has a degree calibrated base. The head mount is a standard 3/8"-16 thread with a 1/4"-20 adapter, if needed. There are 2 spirit levels, one on either side of the top plate to aid in proper alignment. A fourth knob is used to disengage the quick-release top plate which has 4 rubber anti-slip pads.