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- Zinc-plated for resistance to corrosion- Load capacity of 300 pounds- Four-inch square plate- This bearings set has two mounting plates, one for attaching to a stable surface and the other to provide a rotating turntable. The plates are 6" squares of pressed or stamped steel.- This bearings set requires 8 screws for mounting (sold separately) It is suitable for use with revolving shelves in kitchen cabinets, planters, serving platters at the table, and large tabletops, among others.Note:1.Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads2. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use3.The shield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan.