These high-quality screw terminal blocks can accommodate 26 to 14 AWG wire sizes and have UL ratings of 8 Amps & 250 Volts. The 5mm pitch/pin spacing is such that they will fit in standard breadboards. In addition, the terminal blocks can also be soldered into printed circuit boards. These are designed to be interlocking, allowing you to build a custom-length connector of any size. The kit includes 25 pcs - 2 pole, 10 pcs - 3 pole, and 5 pcs - 4 pole. This product is made in China.