The Arca-Swiss L-Bracket is a universal L-shaped bracket that allows you to mount a DSLR or medium-format camera to a head in portrait orientation. One segment of the bracket features a 1/4"-20 screw to which to mount your camera, and both this part and the segment perpendicular feature an Arca-Swiss plate at bottom for mounting to a head.
The two Arca-Swiss plates are adjustable, as they slide on rails and lock in position via a lever. In moments, the plate and the attached camera can slide completely off the rails for a quick change to handheld operation.
The Arca-Swiss plates perfectly fit Arca-Swiss Quickset Classic quick-release systems, and they also fit most other Arca-Swiss-style clamps. The L-Bracket also features a 3/8"-16 thread.