Twin Roller Pillow Block - Linear Bearing TWN-24-OPN 1.5" Shaft DiameterTwin (TWN) Roller Bearing Pillow Block with an open bearing style for a 1. 5" diameter shaft covers twice the space on a linear shaft compared to a single roller pillow block (SPB). The twin pillow block features two sets of 3 opposing roller bearings mounted in a larger twin housing, as if two Single Roller Pillow Blocks (SPB) were fused together. This differs from Double (DPB) Pillow Blocks, which also have two sets of 3 rollers, but the DPB rollers