Rotary encoder to be used with all USB interface boards we sell. The encoder features 16 detents per revolution. Great for increase/decrease functions or for quick scrolling. Simple 3-pin connection to USB interface boards. Encoder has 1/4 inch (6.3mm) diameter shaft. Shaft is made of aluminum and can be cut to shorter lengths as needed. Encoder mounts in a 3/8 inch (9.6mm) hole and can fit panels up to 1/8 inch (3mm) thick.