ITEM NAME:on-Off 2 Positions with Key Switch SPST Description: Come with 2 Keys (Common Keys). SPST 2 Possition on/off. Body Max Dia 15mm (Bezel). Depth Behind Panel 30mm. Hole In Panel Req 11.8mm. Specification: Size: 40x40mm Package Includes: 1 set of barrel switch Note: Please.1 set of barrel switch. The item's color may be slightly different from the pictures due to the light and screen setting difference. People always bought together with. Hole In Panel Req 11.8mm.