Feature:1. COMPATIBLE MODELS: The generator interlock kit is compatible with for Horizontal Main Cutler Hammer CH series only 150 or 200 amp panels. The separation between the main breaker and the branch breaker is 1 1/2 inches.2. MAIN APPLICATION: This kit can prevent both the mains and generator power supplies from being turned on at the same time, avoiding the inconvenience that accidental power outages may cause. Used to safely direct generator power to any circuit in your home, while ensuring that you can safely use all household appliances.3. ALUMINUM ALLOY MATERIAL: Made of premium aluminum alloy material, the generator interlock is strong and sturdy, corrosion resistant, safe and reliable for long term use.4. FINE WORKMANSHIP: After chamfering and appearance oxidation treatment, the generator interlocking kit will maintain a stylish appearance and smoothly surface to defend the user's hands.5. EASY INSTALLATION: Comes with 3/16 drill bits, made of sturdy steel, that can easily pass through the circuit breaker panel. Easy to install without requiring additional control boxes or wiring.Specification:Item Type: Generator Interlock KitMode: EAT CH200AMaterial: Aluminum Alloy.Package List:2 x Interlock3 x Nut 3 x Screw 1 x Drill Bit 2 x Strap 2 x Sticker 1 x Manual