This is one of our most common bearings assembled in a machined metal adapter that is designed specifically for 3” OD tubes. Recommended for mid-sized loads at slower speeds. A metal shield ring supports a polymer sealing ring to hold out small amounts of large particle debris. Not effective in extremely dusty environments. The bearing is lubricated with grease and can be used in powered applications as well as gravity applications. The grease adds rotational drag and is not recommended for gravity applications with very light products.