Hudson bearing hdbt-1 3/16cs heavy duty 1-3/16 carbon steel plastic cover drop-in ball transfer 1-3/16 inch carbon steel main ball rotating on a bed of 1/8 inch carbon steel support balls in a carbon steel machined cup. The cup is hardened and zinc plated. The cover is a plastic retainer. Hudson bearings is an innovative domestic manufacturer of ball transfers. this heavy duty drop-in unit is fully machined from solid steel and is hardened and plated with a plastic cap. housing options include stainless steel. main and support ball options include stainless, nylon, phenolic, and delrin. integral flange can be dropped into a 1.800 inch diameter hole.