SRBB-50 residential bottom brackets with a removable roller carrier, 13-gauge steel, Milford pin, Sold as a matched pair. The removable carrier is the upgrade over standard bottom brackets because you can pop the roller out for replacement without unbolting the entire bracket from the door. The bracket still does the same job: it mounts at the bottom of the panel and holds the lift cable attachment point. Milford pin style, which is standard on most residential doors. When the bracket's bent, the cable sits crooked and the door will not track evenly. Two in the set. Confirm pin style matches your cables.