1. Product Overview The W211PPB3 is heavy-duty square bore agricultural ball bearing with spherical outer ring and triple-layer anti-mud composite seals. Designed for 1-1/2 inch square drive shafts, it fits perfectly on disc harrows, tillage implements and combine harvesters. Spherical outer surface provides self-aligning performance to absorb minor installation misalignment. Non-relubricated sealed construction, interchangeable with DS211TT3, 3AS11-1-1/2 and other OEM farm