midmark ritter m7 or m9 autoclave/sterilizer trays – 002-0253-00 midmark m7 m9 tray midmark ritter m7 or m9 replacement trays come new. never used. these trays fit either model of the midmark ritter m7 or m9. this is considered a small m9 tray or a large m7 tray. this is only a tray, and not the round metal rack structure that supports the tray lip inside the chamber of the machine. the price listed represents one tray. outside dimensions including lip: 12.625” x 6.5” x .75” inside dimensions (area for instruments): 11.678” x 5.5” x .75”