Talmud for Kelim 29:7
שְׁיָרֵי הַדָּרְבָן מִלְמַעְלָן, אַרְבָּעָה. יַד הַבָּדִיד, אַרְבָּעָה. יַד הַקֻּרְדֹּם שֶׁל נִכּוּשׁ, חֲמִשָּׁה. יַד בֶּן הַפַּטִּישׁ, חֲמִשָּׁה. וְשֶׁל הַפַּטִּישׁ, שִׁשָּׁה. יַד הַקֻּרְדֹּם שֶׁל בִּקּוּעַ וְשֶׁל עָדִיר, שִׁשָּׁה. וְיַד מַקֶּבֶת שֶׁל סַתָּתִין, שִׁשָּׁה:
The remnant of the shaft of an ox-goad at its upper end is [considered connected up to a length of] four [handbreadths]. The shaft of a spade is [considered connected up to] four [handbreadths]. The shaft of a weeding-spade is [considered connected up to] five [handbreadths]. The shaft of a small hammer is [considered connected up to] five [handbreadths], and that of a [regular] hammer, six [handbreadths]. The shaft of a hatchet used for splitting [wood] or of one used for hoeing is [considered connected up to] six [handbreadths]. The shaft of a stonemasons' sledgehammer is [considered connected up to] six [handbreadths].