This board allows you to place up to 20 x 1210 ize SMT capacitors on one board, to replace an electrolytic with 0.100" or 0.200" lead spacing. The boards are stackable, and can be built cordwood-style. (The positive and negative rails are on opposite columns on opposite sides of the board, so you can tombstone all the caps on one side of the board, then use hot air or an oven to stick another board to the exposed ends of those caps.)