Smooth rotating swivel plate with hidden interior ball bearing track, allowing for efficient operation and maximum stability, not cranky or disturbing, so you could no more worry about suffering a creaking when rotating turntable bearings breezily. Features - Color: Black. - Size: 17.00X17.00X2.50cm/6.68X6.68X0.98 inch. - Material: Iron. - It is safe and reliable to use, and it is not easy to rust. The black smooth surface makes it look better. - The flat swivel plate is equipped with a ring of ball bearings, making the load more even. The chair will not be damaged due to uneven load. - The ball bearing is coated with a thick grease for lubrication. - Great for replacement use on many stools, bar chair, sofa, display stand, TV stand, station assembly line rotation, etc.