Double Roller Pillow Block Bearing MDPB-30-OPN-S for a 30mm Shaft, ScrapersDouble Cam Roller Bearing Pillow Block for 30 mm steel shafts, open shelled, scrapers on each end, with two sets of 3 opposing roller bearings while maintaining the standard size profile of a Single Roller Pillow Block (SPB); thus the term "Double." By contrast, a Twin Roller Pillow Block (TWN) also has two sets of 3 opposing roller bearings, but the TWN blocks are double sized as if they were two SPBs fused together. Use a floating "F" part number