Check the listing for details. Pass & Seymour 500K Tamper Proof Electrical Switch Key - (12/pack). Condition: New. Listed at 28.50 USD. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Pay only $28.50 When you purchase this: (12/pk.) - Pass & Seymour 500K Electrical Switch Keys That's only $2.38/key This set contains: 12 - "NEW" (OEM) Pass & Seymour 500K (Tamper Proof Electrical Switch Keys) The Pass & Seymour 500K Electrical Switch Key, is the current and newest switch key used by Pass & Seymour in conjunction with their Commercial Grade Tamper Proof Locking Electrical Switches. This type of tamper proof switch is primarily used in Hallways, Auditoriums, Gymnasiums, Foyers and main areas of Elementary, Middle School, and High Schools to prevent students from turning lights on or off. These switches are also used for raising and lowering gymnasium basketball hoops. In addition to Elementary & High Schools, this type of tamper proof switch is also used in commercial building where the switch cannot be accessed by the general public such as Libraries, Corporate Main Foyer, Hospital Complexes, University Campuses, and Local, State & Federal Buildings. .