Diode 6-way selector for diode pairs. Switch shaft fits a 9/32 hole (same as a potentiometer). You can mount germanium diodes, small LEDs, FETS, silicon diodes or solder together 2 diodes in a "Tent" shape for asymmetric clipping. The PCB is 3.1cm x 2.4cm. Kit comes with or without a set of clipping diodes.