BENRO B SERIES Ballhead B-2 Each B Series ballhead includes the appropriate Allen Key and changeable nut so you can mount and tighten the plate security right out of the box The new design of locking knob and the drag adjustment are perfectly designed in accordance with human engineering which makes the operation easier and safer. The damping and locking adjustment design can definitely avoid accidental locked. The new panning lock enhances the locking strength Advanced CNC (Computerized Numeric Control) machine systems provide an unprecidented degree of manufacturing presicion so parts feel and fit perfectly. Superior quality imported aluminum alloy material is used to insure a light weight but super high strength support.