Double Roller Bearing Pillow Blocks (DPB) have two sets of 3 opposing roller bearings while maintaining the standard size of a Single Roller Pillow Block (SPB), which has one set. In contrast, Twin Roller Pillow Blocks (TWN) feature two sets of 3 opposing rollers but are double the size, resembling two SPBs fused together. Double Roller Pillow Blocks provide twice the dynamic load rating in the same footprint.