Reference for Bekhorot 75:1

כמלא נקב של עול

[a size] as large as a hole of a yoke!<span class="x" onmousemove="('comment',' In which a peg is fastened in order to bind the straps (v. Kel. XVII, 12) . Consequently we see that the carpenter's borer is the size of a sela' and, therefore, what is the difference between Beth Hillel and Beth Shammai?');">¹</span>

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