Primer catch bin for the Frankford Arsenal X-10 Progressive Press. The catch bin simply pushes straight into the front of the press housing where the factory clear tubing would normally go in.  There are no screws or other mounting hardware needed, you simply push it into the cavity for a tight pressure fit that will not fall out when full. 
 
The catch bin has a removable tray that makes it super easy to empty and holds approximately 300-350 spent primers depending on if they are large or small primers.