" High quality: the wheel body is made of nylon, which has strong pressure resistance, zinc alloy bracket, light and flexible, maintaining super smooth rolling. Brake function: Pull the "LOCK" switch, the swivel caster can stay still. Pull the ""FREE"" switch, the swivel casters can rotate 360 degrees. Safe for all floors: The wheels won't scratch or leave marks on any surface and roll quietly. These wheels are ideal for office and residential furniture in shared apartments/offices. Widely Application: These wheels Casters perfect for small equipment and furniture, including coffee table, plant stands, bookshelves, shoe bins, toy bins, shopping carts, workbenches.< /p> Note: If our products have any quality problems or you don't know how to install them, please contact us and we will do our best to help you. "