Desigination Code Description  1.Diameter  N2  Ø 22m  , Ø 25mm  N3  Ø 30mm  2.Type  SS  Selector Switch-Knob Type  SH  Selector Switch-Long Knob  KS  Selector Switch-Key Type  3.Shape  R  Round  S  Square  4.Specification  1  2 Position-Stay Put  2  2 Position-Stay Put  3