Name: swivel chair casterType: plunger rod / screw rod / no rodMaterial: NylonFeatures: smooth and silent / no damage to the floorBearing capacity: 125KG / 276lbs (5)Plunger rod:Wheel diameter: 50 mm / 2.0 inchesInstallation height: 55mm / 2.2 inchesScrew rod size: 11 × 22mm / 0.43 × 0.87 inchesScrew rod:Wheel diameter: 50 mm / 2.0 inchesInstallation height: 55mm / 2.2 inchesScrew rod size: 10 × 14mm / 0.4 × 0.56 inchesRodless:Wheel diameter: 50 mm / 2.0 inchesInstallation height: 55mm / 2.2 inchesAperture: 8mm / 0.3 inchInstallation method:Plunger type: First use a screwdriver to pull out the old wheel and directly insert the new wheel.Screw type: Use a wrench to twist the hexagonal screws to complete the removal and installation.Rodless: No tools required, suitable for old connecting rods on swivel chairs.Packing includes: 5 * casters; mounting accessoriesNote:1. Due to differences between different monitors, pictures may not reflect actual colors. We guarantee that the actual style is the same as in the photo.2. Due to manual measurement, please allow 1-2mm error.3. Welcome to our store! Our goal is to provide our customers with the best products and services. If you have any questions, please feel free to contact us. We will serve you within 12 hours and provide you with the best and satisfactory solution!