1.Please check the size: Please carefully understand the size of this product and the size you need before purchasing. The product image as well as the detailed image have detailed size description as well as installation instructions, please carefully compare whether it is suitable for you. 2.360 degree swivel castors 360 degree rotation, easy to move, balance and extend the life. Suitable for all types of soil. The scope of application and installation methods of the product are explained in the detailed images of the product. 3.Easy to install The castors are easy to install and suitable for most office chairs. After removing the old wheels, chair wheels can be used without tools. Check the size of your chair first and make sure our product fits the furniture. 4.Widely used: swivel castors are not only suitable for children's beds, but also for small sofas, chairs, stools, coffee tables, work tables, microwaves, plant and shoe racks, toy stands and other small furniture. 5.Best Service and Warranty We are committed to providing our ers with the product and .