The R166-2RS is a highly resilient, sub-miniature imperial ball bearing engineered for applications exposed to harsh environments, moisture, and fine particulates. Equipped with double rubber contact seals (the "2RS" designation), this bearing locks in its factory-filled lubricant while forming a virtually impenetrable barrier against external dust and liquid splashes. Designed around a standard 3/16-inch shaft size, the R166-2RS delivers unwavering rotational stability and exceptional lifespan for outdoor mechanics, remote-controlled (RC) models, and industrial fluid systems.