Marshall Electronics V-LP-SLDSHOE1/4 Slide-Shoe Adapter

The V-LP-SLDSHOE1/4 adapts a camera's slide-shoe mount to a 1/4-20 threaded stud, so a Marshall articulating monitor arm (such as the V-NF1108-CA, V-DG1108-CA or V-MG6145-CA) can attach directly to the shoe instead of a separate cold-shoe bracket. A captive nut secures the connection once the arm is threaded on.

It's a small, inexpensive part that solves a specific mounting mismatch, letting a monitor arm move between a shoe-mount camera and a threaded rig point without swapping hardware.