Twin Roller Pillow Block Bearing TWN-10-OPN-S 5/8" ID, with ScrapersTwin (TWN) open linear cam roller bearing pillow block for 5 8" shafts (with scrapers), spanning twice the length of a single unit. 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 side within a standard length housing.