Fotasy BH1 Arca Swiss Type Compatible Ball Head with Quick Release Plate (Black) This Arca Swiss Compatible Ball Head is designed for users to mount and remove camera and lens quickly. The easy-to-move ball permits a 360 Degree rotation. The ball can be locked in any desired position by means of a winged screw. Accepts Arca-type quick release camera plate and lens plate by many different companies such as Acratech, Arca-Swiss, Foba, Graf/Studioball, Gitzo, Novoflex, NPC and Wimberley. The safety stops at the front & back of the lens plate prohibit your lens from accidentally slipping out of the quick release adapter(easily removed with supplied hex wrench if desired). Base with 3/8-Inch socket with 1/4-Inch bushing, QR plate with 1/4-Inch threads