Floating Double Roller Pillow Block Bearing F-DPB-48-OPN-S for 3" Shaft Diameter, ScrapersFloating Version of the Double Roller Bearing Pillow Block (DPB 48) for a 3" Diameter Shaft, which has two sets of 3 opposing roller bearings while maintaining the standard size open bearing 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 this floating "F"