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The dimension of this breadboard is 8.3 cm x 5.3 cm. It has 2 power buses, 10 columns and 30 rows - a total of 400 ties in points. All pins are spaced by a standard 0.1"(2.54 mm). It has a self-adhesive on the back and also interlocking parts, so you can hook as many together as you'd like.