GE-200HDA GE General Electric Generator Interlock Kit for Verticle Main 150 or 200 amp panel Generator Interlock Kit for GE 150 or 200 amp vertical throw main breaker Spacing between main and branch breakers is 2 1/4 inches Met lab listed E113887 Kit includes Interlock, drill bit, labeling and retaining strap for generator breaker PLEASE Verify panel type by checking second picture