These switches have a removable ring with tab which can be inserted into the switch several ways to your particular requirements. For example, if you purchased a 1 pole x 12 way (max) switch you could convert it to, say, 1 pole 7 way between stops. They have a standard 1/4 shaft. From 3 pole 2 position to 3 pole 4 position AC current rating : 150mA AC Voltage rating : 240V Mounting Method : PCB Attachment / Securing Method : Snap-in Round Mount Hole Diameter : 10mm Switch Type : Rotary Poles / Contacts : 3 pole Throws / Positions : 4pos Switch Connection : Spade Terminals Break/Make Function : Break Before Make (BBM)