The advantages of plug in screwless terminal block for PCB are the easiness of the wire insertion, solid as stranded wires, that guarantees a high retention of the wire as well as optimal contact. Plug in screwless terminal block for PCB could retain the wires with or without push buttons, in other words the use of a special tooling is not needed. Small pitches such as 2.54mm to high pitches until 15mm are available in our product range, in inches as well as their metric equivalent. http://www.terminal-block-derks.com/plug-in-screwless-terminal-block-for-pcb/