[Chair base set] Included in the package: a universal cylinder, 5 high-quality casters, a metal chair base, a hardware mounting kit.
[Universal size] Office chair base is 28 inches in diameter, cylinder diameter is 50mm (2 inches), universal caster socket size (11mm x 22mm). Compatible with almost all gaming and office chairs, executive chairs, swivel chairs and task chairs.
[Safe for all floor] The office chair base casters use precision ball bearings to provide smooth and quiet movement. Won't scratch and damage your floors
[4.7" stroke cylinder] The gas lift cylinder (Class 3) length is 268mm and the extension length is 388mm. Stroke 120mm (4.7 inch).
[Durable metal base] The material of this computer chair base is metal, which is durable and stable. Durable metal material provides a strong chair base. It can load up to 2500lbs.