Stop Heads are used for capture into free-end cases via the Monotrac V2 Pic-Up Cups (available in Straight Quad, Radius Quad, or Full Arch) 

Stop Heads feature average value cuspid rise lateral ramps of 53 degrees, which can be reduced for flatter full-function occlusion. The adjustable stop screw is easily repositioned in the event the bite must be changed. Stops can be placed at any location to obtain tripod stability on free-end posterior, anterior, or full roundhouse cases for rigid vertical axis and solid centric location.

Additional Stop Screws may be purchased separately if needed.

Resources:

The following video includes a segment demonstrating how to use Stop Heads