Feature 1Compatibility: Interlocking kit is compatible with horizontal mains 150 or 200amp load center circuit breaker panel boxes. Install indoor or outdoor generators. 2Work Process: Interlocking kit prevents utility and generator power from turning on at the same time, avoiding the inconvenience that may result from unexpected power outages. Suitable for 1-1/4in spacing between main breaker and generator branch circuit breaker. 3Easy to Install: The generator interlock kit is supplied with a 3/16 steel drill bit that easily fits through the breaker panel. Easy to install, mounts on the front of the circuit breaker panel, no additional control boxes or wiring required. 4Aluminum Alloy Material: The interlock plate is made of thick aluminum alloy, beveled and oxidized for corrosion resistance and a smooth finish. 5Safe to Use: Interlock kit is used to safely direct generator power to any circuit in your home while ensuring you have safe access to all household appliances.Item Type: Generator Interlock KitMaterial: Aluminum Alloy, Steel .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List2 x Interlocking Plate3 x Nut3 x Screw1 x Drill Bit2 x Tie2 x Sticker1 x Instruction Manual