About this item Made of steel, this swivel plates are strong, sturdy, and reliable. This flat swivel plate is full ball bearings and no need a plastic race to keep the ball bearings separated apart from each other. This also means better at distributing weight and a longer lasting smoother running swivel. Diameter: 160x160mm/6″x6″ , Thickness: 2mm/0.08″ Great for replacement use on many stools, such as chair dining,table,TV,sofa etc. Each package included one chair swivel plate (Mounting hardware not included).