Regardless of whether or not 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 can be used.Suitable for most workplace chair furniture, clean to install, the wheels are made of polyurethane and nylon materials and reside quiet when rolling on the floor.If the wheels are damaged and only one rod remains, you will not know which model will fit your chair. You should buy 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: 150 kg (5 pieces)Colour:BlackMaterial:plasticPackage Contents:5 x castersOnly the above kit content, different products should not included.Note: Light reflection and diversified exhibits may cause the colour of the thing in the photo slightly diversified from the real thing. The size allowed error is +/- 1-3cm.