Nikon AS-2 Gun Coupler, with original box and instruction manual. Used when the shape of the camera's accessory shoe and the attachment part of the speedlight to the camera are different. For Nikon F4 (with DP-20, DA-20), F-801, FA, FE2, NewFM2, F-501, F-401, F-301 Speedlight: For Nikon Speedlight SB-17