Floating Twin Roller Bearing Pillow Block F-TWN-16-OPN-S 1" ID, 2 ScrapersFloating Twin (TWN) Roller Pillow Block Bearing for a 1" Diameter Shaft. Twin pillow blocks cover twice the space on a linear shaft as a single version. This pillow block has two sets of 3 opposing roller bearings mounted on this double sized twin housing, as if two Single Roller Pillow Blocks (SPB) were fused together to make a much larger bearing. This differs from the Double (DPB) Pillow Blocks which also have 2 sets of rollers but the DPB rollers