Leviton 1222-2KL 20 Amp, 120/277 Volt, Key Locking, Double-Pole, AC Quiet Switch, Extra Heavy Duty Grade, Chrome Heavy-Duty Key-Operated Locking Mechanism for Maximum Tamper-Proof Operation in Schools, Institutions, Public Housing, Trailer Parks, Loading Docks, Freight Yards and Other Areas Chrome Lock Dome with 2 Keys Provided per Switch Back and Side Wire Terminals Accept up to #14 - #10 AWG Copper or Copper Clad Wire Large, Combination Head Terminal Screws with External Clamps Triple-Combination Mounting Screws for Fast, Easy Installation