Features:* Made of advantageous material, and reliable* Suitable for bar chairs, office swivel chairs, car seats, reveal stands and more.* Strong load-bearing capacity, not easy to deform or squeeze* Can rotate for 360 degrees freely and smoothly*Uses a quarter-inch ball to avoid noise.* There are 3 diameters for your : three 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 hole turntableNote:1. The real color of the article could also be barely various from the pictures shown on website caused by many factors such as brightness of your video display and lightweight brightness.2. Please allow slight handbook size deviation for the data.