Features: *Compatibility: Our generator interlock kit is compatible with 150 or 200 amp panels. The distance between the main switch and the generator switch is 1-1/4 - 1-1/2 inch. *Safe and Reliable: Our interlock switch kit avoids unexpected power outages and ensures you have access to all household appliances. * and Reusable: The interlock set is made of corrosion-resistant aluminum alloy for durability and reusability. It prevents power from utility and generator from being turned on at the same time. *Package includes: 1 x Breaker Interlock Kit Silver,1 x 3/16 drill bit, 2 x reminder labels, *Quality Promise: For your safety, we recommend installation by licensed electricians. Please measure the distance between the main switch and the next branch switch before purchase. Specifications: Color: As shown in the picture Material: alloy Compatible models: 150 or 200 amp panels Separation:1-1/4 - 1-1/2inch Package Included: 1PCS lOCK 1PCS Drill 2PCS Lables Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Our products are made from very Long-lasting, high-quality materials ,sure to meet the needs of your daily life. Before placing an order, we suggest that you always check the size and model of the product carefully to ensure that the selected product meets your actual needs. If you encounter any problems, please contact us in time, we will try our best to provide you with solutions until the problem is solved satisfactorily. After you receive the product, we attach great importance to your feedback, no matter how your comments, we will listen carefully. Every customer can enjoy the free after-sales service we provide, and any damaged or quality problem products can be refunded or exchanged.