High Durability: Made of high-quality nylon with heat resistance, wear resistance, chemical resistance, and self-lubrication, 100% quality guarantee. Excellent Point: The bottom is made of soft PU material, which will not damage the floor or make noise, maintaining a quiet atmosphere. Size: 11mm x 22mm insert stem, 52mm diameter bottom, glide height: 35mm (1-3/8") Usage: Used to convert home and office chairs with wheels into fixed casters. Package Includes: 5*fixed casters Attention 1. Due to manual measurement, please allow slight errors. Make sure you don't mind before bidding. 2. Colors may vary depending on the display, please understand. Hello, please pay attention to your shipping address when purchasing products. If your shipping information (such as name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly.