This item is well manufactured of premium material for durable and practical use. With heavy duty and 360 rotatable design, they are for rotating book racks, business machine stands, serving trays and kitchen storage racks. Feature - Color: As shown. - Material: Zinc. - Size: Approx. 15.5 x 15.5 x 0.9 inch / 6.1 x 6.1 x 0.4 inch (L x W x H). - Premium material, sturdy and heavy duty. - Zinc-plated bearing is non-rust, non-erosion and sturdy, can satisfy the function of weights bearing. - 6-inch square plate, enough loading capacity of about 50kg. - Ball bearing raceway for smooth rotation. With enough beads inside, you can turn your furniture in flexibility. - Nice tools for assembling furniture, DIY your own indoor decoration or homemade machine. Suitable for home, office, factory, etc. Warm Tip: Dear buyer, due to lighting effect, monitor& 39;s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you