Exodus 26:19

26:19 and you are to make forty silver bases to go under the twenty frames – two bases under the first frame for its two projections, and likewise two bases under the next frame for its two projections;

Exodus 27:11

27:11 Likewise for its length on the north side, there are to be hangings for one hundred fifty feet, with twenty posts and their twenty bronze bases, with silver hooks and bands on the posts.

Exodus 36:24

36:24 He made forty silver bases under the twenty frames – two bases under the first frame for its two projections, and likewise two bases under the next frame for its two projections,