Fulton Bearing Protectors offer an easy and convenient way to protect your trailer axle bearings. Axle bearing contamination is the number one reason for premature bearing failure. Fulton Bearing Protectors make it easy to keep positive lubrication within the axle hub with an integrated zerk fitting and snap ring seals. Fulton Bearing Protectors are available in a range of sizes to cover most popular hub sizes.• Compatibility: 1.98 Inch Hub Diameter Chrome-Plated Steel Construction Easy To Install | Fulton Trailer Wheel Bearing Protector, 1.980 Inch Diameter, w/ Dust Cover