Twin Pillow Block - Linear Roller Bearing MTWN-30-OPN for a 30mm Shaft DiameterTwin (TWN) Roller Bearing Pillow Block designed for a 30mm 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 open bearing housing, as if two Single Roller Pillow Blocks (SPB) were fused together to create a bigger bearing. This differs from Double (DPB) Pillow Blocks, which also have two sets of 3