וְאַרְבַּ֣ע כְּתֵפ֔וֹת אֶ֚ל אַרְבַּ֣ע פִּנּ֔וֹת הַמְּכֹנָ֖ה הָֽאֶחָ֑ת מִן־הַמְּכֹנָ֖ה כְּתֵפֶֽיהָ׃
An den vier Winkeln eines Gestelles waren vier Trageplatten: auf dem Gestell waren die Trageplatten daran.
Rashi
There were four shoulders. As I have explained above, “and its four corners had shoulders,”53Above v. 30. and he did not mention it here only to say, “the shoulders were of the base itself.”54I.e., they were not made separately and then attached to it.