Top quality 3" replacement chair caster featuring floor protective, non-marking Monoprene wheel with precision ball bearings for smooth and quiet mobility and a 7/16" x 7/8" grip ring stem for easy installation – also used on higher end medical stands and IV poles. The chrome finish is highly polished and easy to clean, and the hooded steel design with standard wheel thread guards helps prevent clothing, fingers, and debris from being pinched or caught in the wheel. A standard raceway guard is also factory-installed to keep the raceways clean from debris for a longer caster life. Designed and tested to ANSI/ICWM standards for safety and performance.