Pair of motor brushes for these discontinued models: 1/8 HP Series SR, SRM, and SRB motors (not the current 1/6HP models). 115 and 230 volt 1/8HP Series S, SM, and SB motors. 115 and 230 volt 1/4 HP Series H, HM, and HB motors. 115 and 230 volt Series K motors. 115 and 230 volt Brushes should be checked for wear periodically. When new they are approximately 5/8" long. Replace them when they have worn to 1/4". Be sure to replace both motor brushes even if one of them is less worn than the other.