New Hejnar Photo Long lens support bracket (LLSB), 8 inch rail (G013-80) and 1.5 inch clamp ( F61). Bracket can be mounted to 8 inch rail with a screw if you are using only one lens or can be mount inside clamp if you are using it with various lenses and need to adjust height quickly. To prevent clamp from accidental rotation standard 5mm dowel pin is inserted in opening on rail end.