Home and office replacement casters Built for quality and durability, they are ergonomically designed to reduce the risk of accidents and injury. Casters can help protect you from common concerns such as wrong wheels for the floor surface, worn-flat wheels, worn holes or sockets, bent stems, locked raceway or missing ball bearings. These specially designed soft-tread, vinyl ball casters are 2in in diameter. Ideal for safe rolling on low-pile carpeting and hard floor surfaces. 75 lb. weight rating per wheel.