Complete Replacement BundleIncludes everything you need: 1× reinforced chair base, 1× universal gas lift cylinder (4.7" stroke), and 5× quiet, smooth-rolling 75 mm casters for all floor types. Universal Fit & Floor-Friendly WheelsThe 75 mm caster wheels glide effortlessly on hardwood, tile, vinyl, and most carpets (except thick or high-pile), protecting floors from scratches and marks. Adjustable Height for ComfortThe gas lift cylinder offers a 4.7" adjustable stroke, allowing seat height adjustment from 13.6" to 18.3". Perfect for customizing ergonomic support in any workspace. Ultra-Strong & Reinforced DesignBuilt with a heavy-duty metal base that supports up to 2500 lbs, offering exceptional durability and stability for office, gaming, or task chairs. Easy Installation & Smooth MobilityInstall in just 1520 minutes with no special tools required. Upgrade your chairs mobility with quiet, smooth-gliding wheels and a sturdy swivel base.