Design: Hard floor castors for office chairs in a set of 5. High quality processed plastic. Double castors for lower frictional resistance. Highly abrasion-resistant and non-smearing coating of the castors. Easy gliding, load-dependent braked swivel chair casters. Suitable for office chairs with 11mm PIN (metal pin diameter). Suitable for all hard floors such as laminate, parquet, wooden floorboards, tiles.