[Regarding] the metal cover of a teni belonging to householders, Rabban Gamliel rules it tamei, but the Sages rule it tahor. But [the metal cover of a teni] that belongs to physicians is tamei. The door of a cabinet that belongs to householders is tahor. But [the door of a cabinet] that belongs to physicians is tamei. Tongs are tamei. But perachin are tahor. The akrav of an olive press is tamei. But a hook in a wall is tahor.