These casters are compatible with most chair models and are ideal for various floor types, ensuring a quiet and efficient rolling experience. The silent operation ensuring quiet workspace, while the construction protects your floors from scratches and scuffs. Features -Color:Black -Material:TPR, metal -Size:7.00X5.50X5.00cm/2.75X2.16X1.97in - Wheel diameter: 50mm - Wheel width: 60mm - Maximum load bearing: 45-50kg - Mounting height: 55mm - Screw rod diameter: 11mm - Rod height: 22mm -Noise reduction: these caster wheels are designed to minimize noise, ensuring quiet and comfortable environment -Universal application: ideal for a variety of chairs, offering broad compatibility -360-degree swivel: allows for smooth and easy movement in any direction, improving chair maneuverability - The material is safe and light: which is wear resistance and practical for the lasting time use -Quick installation: these wheels are designed for quick installation, making it simple to upgrade your chair Package list: 5 x office chair swivel casters