A builder’s crowbar and a carpenter’s pick are tamei. Tent pegs and surveyors’ pegs are tamei. A chain of surveyors is tamei. [But a chain] used for wood is tahor. A chain of a large bucket [is tamei up to] four handbreadths, and [a chain] of a small one [is tamei up to] ten [handbreadths.] A stand of blacksmiths is tamei. A saw whose teeth one set into the [door] space is tamei. [But if] one turned it upside down, it is tahor. All covers are tahor except that of a boiler.

The tamei [parts] of a wagon [are as follows]: The metal yoke, the crossbar, the tips that [are designed] to accept the straps, the iron under the neck of the animal, the pulling ring, the harness, the plates, the clapper, the hook, and a nail that connects parts together.

The tahor [parts] of a wagon [are as follows]: A yoke that is plated, tips made for ornamentation, tubes that produce sound, the lead [spheres] on the side of the animal’s neck, the rim of the wheel, the [metal] sheets, the plating, and all other nails are tahor. The metal shoes of animals are tamei, [but those made] of shaam are tahor. At what point does a sword become susceptible to tumah? When one polishes it. And a knife [becomes susceptible to tumah] when one sharpens it.

The metal cover of a teni that one made into a mirror, R’ Yehudah rules [it] tahor, but the Sages rule [it] tamei. A mirror that broke, if it does not reflect the greater part of the face, it is tahor.