Product Name: LAS1Y-11 Push Button Switch Description: 1) The installation hole's diameter of the series pushbutton:16mm. 2) Every pushbutton can possess one to four switch units. 3) Use the gold-clad silver contact or silver contact. 4) The front shape: Round (Φ18mm) Square (18x18mm) Rectangular (18x24mm) 5) Many types are available: pilot lamp, pushbutton, illuminated pushbutton, or switch, and key lock switch. 6) IP Protective Degree: IP40, IP65, IP67