Yagi UCQZ1 Circuit Breaker Panel Filler Plate/Blank Square D, Cutler Hammer, Zinsco Go to amazon.com Related posts Top recommendation for breaker panel blanks FeatureSquare D- QO,QOBCutler Hammer- CH,CHBZinsco- Q,QB,QB24,R38,RC38 DescriptionPanel filler plate for Square D type QO & QOB, Cutler Hammer type CH & CHB and Zinsco type Q, QCAL & QB.