Twin Roller Pillow Block Bearing TWN-24-OPN-SCPTG for 1.5" Shaft Diameter, Scrapers, Grease PortChrome plated twin (TWN) open linear cam roller bearing pillow block for 1. 5" shafts (with scrapers and a top grease port), spanning twice the length of a single variant. This linear bearing uses two sets of three opposing cam roller bearings mounted in an extended housingeffectively two Single Roller Pillow Blocks (SPB) combined into one larger bearing. Unlike the Double (DPB) pillow block, which also has two roller sets, the DPB places them side by