The benro hd series 3 way panheads feature lightweight magnesium alloy contruction and offer smooth front and horizontal tilt and panning movements along with secure locking handles or knobs each 3d head incorporates a snap in style quick release plate system with dual locks graduated scales provide quick and easy repositioning and a built in bubble ensures fast camera leveling supports up to a 110lb load replaces hd 18 cat 450 751 pan lock knob tie down screw safety lock quick