Specification: Material: Zinc alloy Feature: 1.Size: outer length about 34.5mm (1.36") inner length about 27.5mm (1.08") cup height of about 31mm (1.22") total height of about 65mm (2.56") wheel diameter of about 25mm (0.98"). 2.Made of high quality zinc alloy, sturdy, not easy to fade, long service life. 3.Can be 360 ° rotation, suitable for a variety of furniture, piano shelves, tables, cabinets, bookshelves, plant shelves, etc. 4.Single weight capacity: about 500G. 5. Please note that the table corner is only suitable for table corners whose diameter or wide is within 27.5mm(1.08"), larger are not suitable, the inner length of the table corner is 27.5mm (1.08"), if you have any questions about the size of the product, please ask us via Amazon mail, we will give you a satisfactory answer! Important! PLEASE READ CAREFULLY: They look smaller and the total height of the wheels is only 65 mm (2.56"), please check our size chart in case it's too small or too big to fit!