D ground bar kit. For use in square D load centers, CSED devices, and NQOD and Nf panel boards. Each terminal accepts (1) #14 to #4 copper wire, (1) #12 to #4 Aluminum wire, (2) #14 to #12 copper wire, or (2) #12 to #10 Aluminum wire.From the ManufacturerWARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov Ground Bar Kit | For 200A Main Breaker Installed Load Centers | 20-40 Circuits | Necessary With Equipment Used As Service Entrance | Returns will not be honored on this closeout item