Double Roller Pillow Block MDPB-20-OPN for a 20mm ShaftDouble Roller Bearing Pillow Block (MDPB 20) in an open bearing style for a 20mm diameter shaft, which has 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