Verse 30. - And every base had four brazen wheels [As the lavers were used for washing "such things as they offered for burnt offering" (2 Chronicles 4:6), and consequently would require to be continually emptied and refilled, they must of necessity be moveable, so that they could be taken, now to the sea, or other reservoir, now to the altar], and plates [Heb. axles] of brass: and the four corners [Heb. feet; פַּעַם signifies step, thence foot, and is here used of artificial feet. These were, no doubt, at the four corners, and served to raise the stand above the wheels, so that the foliage, etc., was not hidden] thereof had undersetters [Heb. shoulders. "The bearings of the axle" (Gesen.) must be meant. The bases had four feet, which apparently terminated in a sort of socket or fork, into which the axletrees were inserted]: under the laver were under setters [Heb. the shoulders] molten [or cast], at the side of every addition. [Lit., opposite to a man (i.e., each) were wreaths. The explanation of Keil is that "from the feet., there ascended shoulder pieces, which ran along the outside of the chest and reached to the lower part of the basin, which was upon the lid of the chest, and, as shoulders, either supported or helped to support it." He thus understands the "shoulder" to extend from the foot, or axletree, to the bottom of the laver. But it seems quite as likely that these shoulders were within the stand; that they started from its upper corners, i.e., "from under the laver" (as in the Hebrew), passed down along its inner angles, and emerged below - the stand may well have had no bottom - in the shape of feet or forks, which rested on the axletrees, and supported both stand and ]aver. Over against this internal shoulder blade or support was placed externally a wreath. But Bahr despairs of arriving at any just and adequate understanding of this arrangement, and, in the absence of drawings, it is perhaps hopeless that we shall ever interpret the words with certainty.]

7:13-47 The two brazen pillars in the porch of the temple, some think, were to teach those that came to worship, to depend upon God only, for strength and establishment in all their religious exercises. Jachin, God will fix this roving mind. It is good that the heart be established with grace. Boaz, In him is our strength, who works in us both to will and to do. Spiritual strength and stability are found at the door of God's temple, where we must wait for the gifts of grace, in use of the means of grace. Spiritual priests and spiritual sacrifices must be washed in the laver of Christ's blood, and of regeneration. We must wash often, for we daily contract pollution. There are full means provided for our cleansing; so that if we have our lot for ever among the unclean it will be our own fault. Let us bless God for the fountain opened by the sacrifice of Christ for sin and for uncleanness.And every base had four brasen wheels, and plates of brass,.... Flat pieces or planks of brass, on which the wheels stood, and not on the bare floor; so that these wheels seem only to serve as supporters, not to carry the laver from place to place, as is usually said; for they were not like chariot wheels, on two sides of the carriage, but set one at each square; and besides, when the lavers were placed upon them, they were fixed in a certain place, 1 Kings 7:39.

and the four corners thereof had undersetters; or "shoulders (a)", or pillars, which were placed on the plates of brass the wheels were; and served with them to support the lavers when laid upon the bases, and so were of the same use as men's shoulders, to bear burdens on them:

under the layer were undersetters molten; cast as, and when and where, the bases were, and the plates on which they stood; this explains the use they were of, being under the laver; these pillars stood at the four corners of the base:

at the side of every addition; made of thin work, 1 Kings 7:29 they stood by the side of, or within side, the sloping shelves.

(a) "humeri", Pagninus, Montanus, &c.