This Inline Fabrication Output and Empty Case Bin System is for the Dillon 450 & 550 B and newer C model. The rear bin catches your completed rounds via the custom aluminum discharge ramp and bracket system. The front bin holds your empty cases up close and quick to grab. Output ramp is designed for increased access to the shellplate loading for easy brass insertion. Note: Designed to be used with the Inline Fabrication 4",7.5" or 9" tall Ultramount press risers only. Not flush mount. It needs a riser system to provide clearance for the bins. I t does not work with the factory Dillon Precision Strong mount.