Regardless of whether or not the wheel hub is threaded or circlip type, as lengthy as the plunger length 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 stay quiet when rolling on the floor.If the wheels are broken and just 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: a hundred and fifty kg (5 pieces)Colour:BlackMaterial:plasticPackage Contents:5 x castersOnly the above package content, different products usually are not included.Note: Light reflection and varied exhibits may cause the color of the article in the photograph a bit various from the genuine thing. The size allowed error is +/- 1-3cm.