Proudly made in the USA! GenSafety manufactures a high quality line of generator breaker interlock kits. These interlocks are made of 6061T-6 aluminum and are sand blasted and then color anodized. They look professional and they make the installer look professional. There are no sharp edges or plastic components on the assembly like you find on similar kits. The GEN-100 Interlock Kit fits GE 100 amp panels with a horizontal throw main breaker and 1 3/8" vertical spacing between the closest edge of the main breaker cut-out and the closest edge of the generator breaker panel cut-out. Please see the attached photos. This interlock kit meets the requirements of Article 702 of the National Electric Code ANSI/NFPA 70. NEVER back feed a breaker panel without a generator breaker interlock kit. Doing so could easily energize utility lines with very high voltages that could easily be lethal to a lineman or other utility worker. Be safe and do the right thing. These quality kits are money well spent. The kits include: Anodized aluminum generator breaker interlock assembly Clear and simple installation instructions A high quality 3/16" drill bit Name brand thread lock compound Generator breaker retaining strap Vinyl weatherproof complete label set Once you purchase an interlock kit from GenSafety you wont ever want to purchase any other brand.