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”