... with a single hand easily in 10 seconds .6. Locking devicem,inn-,ounted design,sand -protecting,waterproof,antiseptic and ... burden.8The middle axle locking device.Flying wing center column locking knobFlying wing design of center cloumn locking knob, which can adjust ... multi-angel,low position and microspur.Tube locking systemAdopt rapid pull button locking design,can makes photographers fix the tripod ...