Important Note:
We have recently changed the R designation of our curves and switches away from an arbitrary nomenclature used by other manufacturers to a representation of the closest effective radius in feet.  So a R4 switch is a 4' radius switch, a R7 switch is a 7' radius switch, a R7/R4 switch is a curved switch that switches from 7' radius to 4' radius.

3 Way Switches are basically two switches that are staggered inside each other.  These switches come in two different versions Left First or Right First (Brass and Nickel)