The Kirk BL-D850G L-Bracket for the D850 digital SLR is a custom-made one-piece aluminium L-Bracket for the Nikon D850 with the MB-D18 grip attached. When attached it allows quick changes from horizontal to vertical composition & vice-versa without having to adjust your tripod and/or tripod head. The L-Bracket from Kirk attaches directly to Kirk Ball Heads & other ' Arca-Type' heads.