Buyers Products 2 Inch Set Screw Locking Flange Bearing (4 Bolt) is built for long life with simple installation and maintenance. The driveline-grade steel bearing is mounted in a cast iron housing, which helps make the flanges rugged and durable. The included grease fitting ensures ease of maintenance for continual smooth operation. The standard 4 bolt mounting design makes installation easy even in tight places. Its set screw design helps avoid shaft slippage.