Package: 12 wheels . You can use shorter brackets (16mm long) if your mounting base is not thick, for example on a furniture board. The two shorter and longer ones are included in the set with the casters Materials: metal plate, rubber (grey part), plastic (black part). Mounting plate with 2 fixing holes. Wheel diameter: 25 mm. Hole spacing: 28 mm. Maximum load: 25 kg per wheel The wheels are made of high quality rubber, which ensures durability and easy smooth rolling. Wide range of uses. The wheels look great in different environments (from industrial places to your home) The position of the wheel ensures smooth and easy rolling. These casters are ideal for a wide variety of uses, from DIY to industrial applications (home, schools, garage, shops, trolleys, table and hospitals). Perfect for small equipment and small space furniture, including ottoman, coffee tables, bookshelves, shoe bins, plant stands, toy bins, shopping trolleys, workbenches, under bed storage, etc. Dimensions: base plate length 43mm, width 20mm, installation height: 31mm, wheel diameter: 25mm, opening 4.2mm Color: silver Note: 1. For manual measurement, please allow an error of 1-2 cm. 2. The color may have a little difference due to lights, screens, etc.