Twin Industries Combination Boards combine standard prototyping boards with solderless breadboard modules. Components can be soldered in place or easily removed and replaced from the solderless area. The modules are connected by traces to pad per hole area. The solderless board features 5 holes per pad with a 0.1" by 0.1" grid of holes. The plated holes are 0.037" in diameter and feature a 0.062" thick lead-free PCB with gold plating. A 3mm screw or nut is included to secure the module to the board (additional soldering required).