Box Accessories 66 Protector plate. Meets requirements of CEC rule 12-616. 7901 Rework bracket for use with octagonal boxes. Maximum load capacity: 10 lbs. (5 kg). 7902 Steel stud foot extender. Add to existing MSB foot to facilitate 6" steel stud installation. 820-D Device box supports. LRW Rework bracket. For use with 2" x 3" device boxes with plaster ears. SBEX 2" x 3" device box extension. Adjustable depth up to 7/8".