Flexpost sm sign bracket kit 2, a-sm-sb optional aluminum sign brackets, attaches back-to-back signs with no post drilling. All stainless steel hardware included. Designed to fit any 1 7/8″ post. for use with: sm-55spcp sm-c-55p sm-a-55p sm-g-55p sm-d-55p sm-42spcp sm-c-42p sm-a-42p sm-g-42p sm-d-42p