The AP-502 replaces the stock foot on Nikon Lenses. It is made to slide right into an Arca-Swiss style quick-release clamp. It also has 1/4" and 3/8" tapped holes to mount non-quick-release tripod heads and monopods. All replacement feet feature dual safety stops and flash bracket compatibility. Eliminating the need for extra quick-release plates enhances the handling on standard tripod heads.