Features:* Made of positive material, and reliable* Suitable for bar chairs, workplace swivel chairs, vehicle seats, reveal stands and more.* Strong load-bearing capacity, demanding to deform or squeeze* Can rotate for 360 levels freely and smoothly*Uses a quarter-inch ball to bypass noise.* There are three diameters in your : 3 inches, 4 inches, 6 inchesSpecification:* Material: galvanized sheet* Colour: Black* Optional diameter: 3 inches, four inches, 6 inches* Size: 3 inches 71*71mm, 4 inches 94*94mm, 6 inches 155*155mm* Quantity: 1PCSPackage content:1 x hollow turntableNote:1. The real color of the article may be barely diverse from the images shown on web page attributable to many factors such as brightness of your monitor and light brightness.2. Please enable slight handbook dimension deviation for the data.