Trubore bearing, heavy duty, standard taper joint, self-aligning. Unique 3 piece design of Trubore inner bearing, compression seal nylon bushing and glass standard taper adapter allows for moderate misalignment of stir motor and the bearing cannot sieze the shaft. For use with 8077 & 8078 19mm od precision ground shafts and 8079 PTFE covered shafts. See 7855-734 for replacement bushing o-ring.