Compatible with Consew models 225, 226, 339, 254B-3, 254RB-3, 255B-3, 255RB-3, 339RB-1, 339RB-3, 339RB-3D, 339RB-4, 339RBATC, and 339RBL-25, as well as Seiko LSW machines. Includes alternate part numbers 100080-001, HA304G0656, SS-4080620-TP, 10601, and 200106, and measures 5/16" in length.