The 1961 and later Berg B Model is 24” wide and 24” front to back with aluminum trim. The trays are 19-1/2” inside dimension. It will accommodate both wide and narrow trays. It will hold 18 wide trays or 30 narrow trays, or combinations of 9 wide and 15 narrow or 12 wide and 10 narrow.

Spacing is 4 empty pegs between wide trays, 3 empty pegs between a wide and a narrow tray, and 2 empty pegs between narrow trays.