About this item Plain Bearing: Works in coordination with the machine in a uniform rotational speed, largely improves the efficiency. ?4Pcs in 1 Set: Including 4pcs spherical plain bearing, which adds more convenience to installation and replacement. Broad Utility: Widely used in engineering hydraulic cylinders, forging machine tools, engineering machinery and so on. Good Material: Forged with high quality high carbon bearing steel, very durable with wearing and corrosion. Sturdy Design: Long, thin, the sturdy structure with even hardness ensures great load bearing capacity with stability.