“Extensive use of copper is made in the construction of the 'tabernacle of Yahweh' (Exod. 27) and the Jerusalem temple (1 Kgs 7). In the latter case, the entrance to the temple is described as being flanked by two large columns wholly made of copper (termed Boaz and Yakhin, 1 Kgs 7.15-22). These two bronze columns are not pillars supporting the roof [of] the Temple. Devoid of any architectural function, their presence should be considered as purely symbolic. By their outstanding dimensions (about 9 meters height and 2 meters in circumference), they were the most prominent symbol of the Temple. (pp. 394-395)

from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404”