Custom replacement lens for the NEW Canon EF100-400mm. f/4.5-5.6L IS II USM. This foot features mounting geometry to conform to the unique shape of the lens collar when the Canon foot is removed. It mounts with a single screw using a hex wrench. Fits most ARCA style quick release clamps including RRS. Smoothly countered for weight reduction and comfortable grip. Features a secondary dovetail for flash brackets, theraded monopod mounting hole, and anti-drop screws. Included: lens foot, mounting screw, anti-drop screws, hex wrenches for mounting and anti-drop screws.