Recommended for medium to heavy loads in wash-down or wet environments. Most of the bearing is made from 316 stainless steel to prevent rust and corrosion. The hex adapter is made from polypropylene and reduces noise during operation by preventing metal-on-metal contact between the bearing and axle. A hole in the hex adapter allows the bearing to be regreased through the axle. Bearings that are regularly regreased can withstand very high levels of debris without damage. 304 stainless steel shields deflect large particle debris and protect sealing rings that block smaller dirt and debris. Not effective against small particle dust. Grease keeps this bearing lubricated for continuous use but increases the rotational drag. Not recommended for gravity applications with light products.