STABLE: Replace your chair casters with bells for more stability! The fixed end caps allow you to convert the swivel office chair with casters into a fixed chair without losing the height of the chair. PACK OF 5: With this set of 5 bells you have a practical replacement set for office or gaming chairs, for example. It is suitable for classic office chair brands. DIMENSIONS: Outer diameter: 50 mm and inner diameter: 10 mm, maximum weight for 5 wheels: 200 kg, spindle length: 22 mm < p >PROTECTION: The fixed end caps serve as rubber protection for all your floors. They are designed for use on hard surfaces: parquet, linoleum, laminate, tiles, etc. EASY INSTALLATION: No tools are required for assembly. Remove your seat casters and attach the bells.