The Velbon PHD-41Q Pan/Tilt Head is a 3-way panning head with a quick release and a large spirit level right at the quick release assembly. It is perfect for a medium-sized SLR camera with moderate zoom lens, with a 51 x 45mm mounting surface for the quick release plate. A single arm facing towards the photographer loosens/controls the panning and tilt axes, and a second arm (to the right of the photographer) controls the horizontal axis adjustments. The PHD-41Q fits on any tripod or other device with a 1/4&quot-20 threaded protruding screw.