Standard size 2 inch office casters, a set of five, each caster diameter and width are 1.97 inches (50MM), stem size:7/16" x 7/8".each caster bearing 88 pounds, weight is 0.23 poundsLong-lasting and durable Full-screen plastic material, sturdy, safe and wear-resistant, fast turning, no noise sliding, flexible rolling in any office and no noiseSafety protection It is suitable for the replacement casters of office chairs. The surface that touches the ground is made of high-toughness PA nylon material. Whether it is a smooth floor or indoors with floor mats, it can make the chair slide more quietly on the floor.Light & Stable This furniture light caster can rotate 360 degrees, and the wide wheel surface slides stably. The high-end silent caster for office chairs can be quickly installed on racks, drying racks, office chairs, furniture cabinets and other items.Simple installation It can be easily installed without tools or hardware. Just take out the old casters and push in the new casters. You can check the compatibility of the casters again before use. Our chair wheels will be your best choice for upgrading your chair.