Plumber blocks are housing type assemble of heavy Load when compared with pillow block, which can take heavier load. It is open able type and can be tightened by bolt, after fitting the bearing in it. Ball Bearing and Spherical roller are used with a sleeve and lock nuts in these blocks. Sleeves/Locknuts/Washers Adapter Sleeves, Locknuts, washers are part of assemble of Bearings