Upgrade kit for original MK16 Oktober Can Seamer and MK19.2 Oktober Can Seamer to allow use of MK16v2 lower adapters. Includes the new design lifter shaft, bearing, spring/washer, and (2) adapters. The included adapters work for 12oz cans and 16oz cans for the MK16 can seamer. MK19 can seamers also require the 16 oz Lower Chuck Adapter (Mk 19.2)