The generator interlock kit for General Electric GE 150 or 200 amp panels with 1 1/4 inch spacing between main and branch breaker. Please compare appearance spacing and size with your unit before purchase, make sure it will fit you very well. The generator interlock kit with drill bit, sturdy steel that goes through breaker panel easily, so can be quickly installed for use. The generator lock consists of two sliding metal plates held together by three bolts. And it is made of aluminum alloy, the surface is anodized for better electrical insulation and heat insulation. You will receive 1 interlock plate, 3 shoulder screws, 3 hex nuts, 1 generator start-up procedure label, 5 remind label, 2 zip ties, 1 instruction bulletin, 1 drill bit. Welcome to contact with us before or after your purchase. Our warm & responsible always be here for you.