Exodus 36:33
They made the middle bar, fixed halfway up, to run from one end to the other.
They made crossbars of acacia wood: five to hold the boards together that were to form one side of the Holy Tent,
In this way, there were eight boards with their sixteen silver bases, two bases under each board.
These boards were joined at the bottom and top, up to the level of the first ring; this they did with the two boards that were to form the two corners.
with forty silver bases to put under the twenty boards: two bases under the first board to receive its two matching arms, and so on for the other boards.