This set includes 5 green terminal blocks, each with 2 connection points and a pitch of 2.54mm. This sizing makes them compatible with standard experimental boards and breadboards, which also have a pitch of 2.54mm. A key feature of these terminal blocks is the ability to create a very sturdy connection with wire sizes ranging from 14 to 22 AWG. This is achieved by tightly screwing the screws on top of the terminal block. They are easy to install and provide a reliable and durable connection for your electronic projects.