This kit has four sizes of screw terminal blocks and 40 pieces total. There are five two-pole and five three-pole connectors for each size. The kit consists of screw terminal blocks with the following pitch/pin spacing: 2.54mm, 3.8mm, 5.0mm, and 7.5mm. This variety pack has screw terminal blocks accommodating many different wire sizes, pitches, currents, and voltages. See the photo with the datasheets for current and voltage ratings and other specifications. This product is made in China.