Product Description Tired of the constant scraping noise when moving the task chair? Chair Caster Wheels Features: UNIVERSAL STEM SIZE - 7/16" (11mm) x 7/8" (22mm)- fits office chairs sold in the USA with 11mm stems. (it is not compatible with I-K-E-A chair) RELIABLE CONSTRUCTION - frame, stem and wheel axle all made of high-grade steel. The casters are made of durable hard plastic with a shell of top-quality transparent polyurethane. EASY INSTALLATION – Just pull off the old casters from the chair base, with no need for any tools - and push the stem of your new office chair wheels into the socket, until the stem is firmly anchored. Product description Effortless and Whisper-Quiet Rolling Stay focused on your task instead of distracted and annoyed by the squeaking and sticking of cheap plastic or metal office chair casters.Get rid of being tighed down to your office chair mat. Unparalleled Durability: Get the Best Value for Every Penny You Invest High grade steel, precision ball bearings, and durable polyurethane chair casters were carefully chosen for a heavy duty and long lasting design. Buy these office chair wheels once and enjoy them for many years to come. (especially if used as chair casters for hardwood floor) erfect for more than just the computer desk chair These Antique rubber chair casters Wheels provide a great upgrade on chairs for conference rooms, drafting, cubicle, reception, and executives. Or use these on stools that roll (saddle, tractor, etc.) in areas like dental, medical, salon, barber, even tattoo. PC video gamers will agree they are ideal wheels for office chairs.