Aluminum construction exit port pins intended to be replacements for the polymer ones that have snapped off. These posts are threaded, and require the user to create an appropriately sized hole, and use a #4-40 tap, along with an epoxy for sealing and retention purposes. Standard flat matte black anodized finish. 
 
The purpose of the exit port pins is to allow attaching of NDFs (Neutral density filters) and pattern generators that come standard with each ATPIAL device.

These posts are used on a variety of devices such as the PEQ2/ PEQ15/ PEQ16/ LA5/ PSQ20B, and CNVD series of thermal devices.