Midmark Ritter M9 replacement trays come new. never used.  These trays fit the Midmark Ritter M9.  This is considered a Large M9 tray. This is only a tray, and NOT the round metal rack structure that supports the tray lip inside the chamber of the machine.  Large M9 Tray: Outside Dimensions including lip: 8” x 12.75” x .75” Inside Dimensions (area for instruments): 7.25” x 12” x .75”