This RCS Flange Bearing UCF 208 is perfect for use with a 40 mm shaft. It is brand new and unused, meaning it is in perfect condition and ready to provide many years of reliable service. The flange bearing is made of high quality steel, designed to withstand even the toughest conditions.This flange bearing is an essential component for any range of mechanical systems that require precise and smooth movement. Its robust construction and simple installation make it an ideal choice for a variety of applications.