Regardless of whether the wheel hub is threaded or circlip type, as long as the plunger size is 23mm-26mm and the plunger diameter is 8mm, this rodless caster would be used.Suitable for many workplace chair furniture, clean to install, the wheels are made of polyurethane and nylon materials and stay quiet when rolling on the floor.If the wheels are broken and only 1 rod remains, you will not know which model will fit your chair. You should purchase rodless casters.Wheel diameter: 50mm/2 inchesWheel width: 38 mm/1.5 inchesHole diameter: 8 mm / 0.31 inchesHole depth: 26 mm/1.02 inchesInstallation height: 58mm/2.3 inchesCarrying capacity: one hundred fifty kg (5 pieces)Colour:BlackMaterial:plasticPackage Contents:5 x castersOnly the above kit content, other merchandise are usually not included.Note: Light mirrored image and different exhibits can cause the color of the article in the photo just a little diversified from the real thing. The measurement allowed error is +/- 1-3cm.