1. Easy to install: The heavy duty office chair caster wheels are easy to install, no tools required! Just pull out the wornout old wheels from your chair, align the rod of the office chair caster wheel with the mounting hole at the bottom of the chair, and then steadily push the rod into the mounting hole until you can feel that it is firmly locked in place. After the installation is completed, you can start experiencing smooth and quiet gliding. 2. Fit most swivel chairs:The stem size of our desk chair wheels is 7/16 inch x 7/8 inch, universal fit for most office chairs, Computer chairs,Conference room chairs,Make up chairs,Leisure swivel chairs,e sports chair. (Tips:Our office chair wheels are not compatible with I K E A chairs) 3. Quiet and Smooth:The wheel pieces are made of polyurethane material, which has good elasticity and flexibility, enabling the wheel to effectively reduce the friction noise with the ground when rolling, creating a quiet atmosphere for the office environment, and is especially suitable for use in offices, conference rooms and other places where quietness needs to be maintained. 4. Long Lasting Durability:Made from steel, precision ball bearings and polyurethane, our replacement wheels for office chair models provide you with years of use. The maximum load capacity of wheels set of 5 is up to 200kg.