שְׁמֹנֶה֩ עֶשְׂרֵ֨ה אַמָּ֜ה קוֹמַ֣ת ׀ הָעַמּ֣וּד הָאֶחָ֗ד וְכֹתֶ֨רֶת עָלָ֥יו ׀ נְחֹשֶׁת֮ וְקוֹמַ֣ת הַכֹּתֶרֶת֮ שָׁלֹ֣שׁ אמה [אַמּוֹת֒] וּשְׂבָכָ֨ה וְרִמֹּנִ֧ים עַֽל־הַכֹּתֶ֛רֶת סָבִ֖יב הַכֹּ֣ל נְחֹ֑שֶׁת וְכָאֵ֛לֶּה לַֽעַמּ֥וּד הַשֵּׁנִ֖י עַל־הַשְּׂבָכָֽה׃
The height of the one pillar was eighteen cubits, and a capital of brass was upon it; and the height of the capital was three cubits; with network and pomegranates upon the capital round about, all of brass; and like unto these had the second pillar with network.
Rashi
One crown was five amohs high. And at the end of the book it states, “three amohs.” We learned in the Mishnah of “Forty-nine Measurements,” that the two lower amohs of the crowns were similar to the column because there were no designs in them, and the three upper [amohs] that extended beyond, were surrounded with designs, as it is stated, “branches designed like net [mesh] work,”26Below v. 17. by the likes of the branches of a palm tree they were surrounded But I say, that the two lower amohs were not counted at the end of the book [of Melachim] because they were similar to the column and the column were inserted into the crown two amohs.