The V Lock Assembly is part of the popular IDX and Element V Dock. It has a variety of mounting options. It can be attached directly to a top mount, various "Cheese" Plates, or Cheese Stick top handles using a 1/4-20 low head socket cap screw.
This assembly can also be mounted directly to the Shoulder Pad Mount on camera support equipment like the Mantis. This makes a great mounting point for accessories like a Red Drive equipped with a Shock Mount, or the Red Battery Plate, equipped with the Element Battery Interface Plate with V Lock. Having an accessory mounted on the rear of the Shoulder Pad Mount brings the center of gravity further down and toward the rear of the camera, which makes the camera much less front heavy.