Reference for Kelim 13:4
מַגְרֵפָה שֶׁנִּטְּלָה כַפָּהּ, טְמֵאָה מִפְּנֵי שֶׁהִיא כְקֻרְנָס, דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים מְטַהֲרִין. מְגֵרָה שֶׁנִּטְּלוּ שִׁנֶּיהָ אַחַת מִבֵּינְתַיִם, טְהוֹרָה. נִשְׁתַּיֵּר בָּהּ מְלֹא הַסִּיט בְּמָקוֹם אֶחָד, טְמֵאָה. הַמַּעֲצָד וְהָאִזְמֵל וְהַמַּפְסֶלֶת וְהַמַּקְדֵּחַ, שֶׁנִּפְגְּמוּ, טְמֵאִים. נִטַּל חִסּוּמָן, טְהוֹרִין. וְכֻלָּן שֶׁנֶּחְלְקוּ לִשְׁנַיִם, טְמֵאִים, חוּץ מִן הַמַּקְדֵּחַ. וְהָרוּקְנִי בִפְנֵי עַצְמָהּ, טְהוֹרָה:
An ash-rake whose shovel end was removed is susceptible to impurity, since it is like a hammer: the words of Rabbi Meir. The Sages declare it pure. A saw missing every other tooth is pure. But if a <em>m'lo hasit</em> [distance between the splayed thumb and forefinger] of consecutive teeth remained, it is susceptible to impurity. An adze, scalpel, plane, or drill that was damaged is susceptible to impurity. If its steel edge was missing it is clean. In all these cases if it was split into two, both [parts] remain susceptible to impurity, except for the drill. The block of a plane by itself is pure.