Our 3-inch office chair wheels are manufactured from tremendous PU and high-grade Metal, ensuring smooth, quiet rolling and advanced durability. Designed to slot 98% of standard pole (7/16inch x 7/8inch) workplace chairs.Experience smooth, noise-free rolling with precision ball bearings on the caster swivel and shaft. Glide smoothly and quietly with our effective cushioned rubber casters. Work or play quietly without stressful anyone around you.PROTECT YOUR FLOORING: Our alternative workplace chair wheels are designed to guard hardwood, laminate, tile, slate and all different not easy flooring from any prospective damage. Enjoy carefree gliding on a wide range of surfaces and not fear about scratches or marks again.Quick installation: Say so long to confusing setup! Our 3-inch workplace chair wheels are tremendous smooth to install - no instruments required. Easily eliminate the previous casters from the chair and insert the hot casters securely to guarantee a safe fit. Enjoy worry-free upgrades!Colour:blackMaterial:Metal+PUSize:Insert rod: eleven x 22mm, wheel diameter: about 76mmPackage Contents:5 x Office Chair WheelsOnly the above equipment content, other products aren't included.Note: Light mirrored image and various reveals may cause the colour of the object within the picture slightly diverse from the real thing. The measurement allowed error is +/- 1-3cm.