Features: The sufficient quantity of these swivel chair bell glides is enough and suitable for you to share with your family, coworkers, friends and others, to enjoy a stable sitting experience. These caster wheels for office chairs are easy and convenient for most people to install, you just need to insert the wheel stems into your chairs feet without tools, which can bring you much convenience. Specifications: Main material: nylon Main color: black Size: Width: about 2 inch/ 5.08 cm Bearing capacity: about 1000 lbs/ 453.56 kg Stem length: standard 7/16 x 7/8 inch/ 11 x 22 mm Package includes: 50 x Low profile bell glides replacements Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. Check the size before ordering.