SD-100A Square D Generator Interlock Kit QO & Homeline Indoor or outdoor 100 or 125 amp panels Generator Breaker Interlock for Square D QO or Homeline Indoor or outdoor with main 100 or 125 amp panels 3/4 spacing between main and branch breakers Met Lab listed E113887 Kit includes Interlock, labeling, drill bit and generator breaker retainer strap PLEASE Verify panel type by checking second picture