1、HOW IT WORKS: The generator interlock kit avoids the inconvenience that can be caused by unexpected power outages, used to safely direct generator power to any circuit in your home. This is indeed a good way to securely connect the generator while ensuring that you can use all household appliances 2、SMOOTH AND DURABLE: Built in excellent chemical corrosion resistance and thick solid aluminum interlock switch plate, very durable, can be used for a long time. Treated with chamfering and surface oxidation, the generator interlock kit will maintain a stylish look and a smooth surface to protect user hands 3、EASY INSTALLATION: The generator interlock kit provides 3/16 drill bits in sturdy steel that can easily fit through the circuit breaker panel without additional control boxes or wiring 4、COMPATIBLE MODELS: Generator interlock kit is compatible with for Square D QO or for Homeline 150 or 200 amp panels 5、REQUIRED SPACING: 1 3/8in spacing between the main circuit breaker and the generator circuit breaker in the generator interlock kit