hard floor casters for all surfaces, office chair casters Product name: furniture casters Material: Nylon Installation Size: 11x22mm color: gray Load: 20-25 kg Package Contents: 5x wheels. To notice: 1. There may be 1-2cm error in manual measurement, please understand. 2. Due to different monitors, there may be errors in the color of the actual object and product pictures. Versatile use - the wheels can be used on any surface: carpet, hard floors, laminate or parquet. Thanks to the high-quality plastic, the castors of the swivel chairs are quiet and smooth and do not damage the valuable floor. Universal size - 50 mm diameter rollers with a shaft diameter of 11 mm are suitable for the most popular models of office chairs. For safety, please measure the pen hole on your office chair before ordering. Movement regulation - office chair castors change their direction and adapt to your movements. They are particularly suitable for hard floors and ensure that the chair rolls easily and evenly on the floor. Quiet operation - glide over your office chair as you please. Even in the evening in the home office, thanks to our castors for office chairs, no one will disturb your work. Also suitable for players who play deep into the night. Tip - for safety measure the pen hole on your office chair before ordering.