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 7/8 - 1 1/4 inches. *Safe and Reliable: Our interlock switch kit avoids unexpected power outages and ensures you have access to all household appliances. *Durable 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:7/8 - 1 1/4 inche 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. Made of high quality material, durable and practical to use. Perfect functions,give you a wonderful experience. If you have any questions, please feel free to contact us, we will solve it for you. Every customer can enjoy 30 days refund or replacement for Damaged/Quality Issues. Generator Interlock Kit Compatible with Sie-P2 150 Or 200 Amp Panels.