【2 inch swivel chair casters】：5 office chair glides, stem diameter 11 mm, base diameter 50 mm, installation height 60 mm. Chairs that cannot be used with 10 mm casters are fixed casters for 2 inch swivel chairs. 【Better floor protection】: The package contains 5 pieces of felt pads. The bell slider set has a soft felt bottom that can better protect your soft floor. The felt mat can reduce the effects of weight and ensure that it remains quiet during use. 【Black Nylon Material】: Nylon material better protects the floor. The office chair caster is made of high-quality solid black nylon material, thickened and durable, the bearing is strong, can be a cost-effective chair wheel replacement. 【Easy Replacement】: Replace old and worn rollers, easy replacement, remove the old rollers/gliders and insert new glides. With these bell glides for office chairs-stool, office chairs with Casters can be transformed into a stationary chair without losing the chair height. 【Floor Glides for Chairs】：The