Features:* Made of fine material, and reliable* Suitable for bar chairs, workplace swivel chairs, vehicle seats, exhibit stands and more.* Strong load-bearing capacity, not easy to deform or squeeze* Can rotate for 360 levels freely and smoothly*Uses a quarter-inch ball to avoid noise.* There are three diameters to your : 3 inches, four inches, 6 inchesSpecification:* Material: galvanized sheet* Colour: Black* Optional diameter: 3 inches, 4 inches, 6 inches* Size: 3 inches 71*71mm, 4 inches 94*94mm, 6 inches 155*155mm* Quantity: 1PCSPackage content:1 x hole turntableNote:1. The real colour of the article could also be slightly diversified from the photographs shown on online page attributable to many factors corresponding to brightness of your visual display unit and light-weight brightness.2. Please allow slight manual size deviation for the data.