Closed Pillow blocks are for use with END supported shafting.For use with MM class Shafting.Ball Bushing Bearings are included and factory installed in each Pillow BlockSpecificationsSpecificationsValueAdjustable/Not AdjustableAdjustableBlack OxideBlack AnodizeClosed/OpenClosedMaterialAluminum; Plastic; RubberNumber of Ball Circuits10Self AlignmentSelf-aligningSingle/TwinTwinTemperature Max185 °FWeight0.41 kgDimensionsDimensionValue[d] Shaft, Nominal Diameter12 mm[G2] Access for LubricationM6 x 1