Heavy Duty Pillow Block UCP205-15 Bearing 15/16" Inner DiameterHeavy Duty Pillow Block UCP205 15 Pillow Block Bearing Cylindrical bore (with set screws) 15 16" Inner Diameter This is the most common type of Heavy Duty mounted ball unit. The rib at the bottom of the housing mounting section provides for a robust unit that can withstand great loads from any direction. Heavy Duty Mounted units with cast steel housings are also available in this seriesand are used for applications with severe loading and shock load