HUBERT Blue Polyurethane Expandable Rubber Stem Replacement Caster Kit - 5"Dia

This set of 4 expandable rubber stem casters has 7/8" stem that will fit a wide range of round or square tubing. to compress rubber, tighten topmost ring until it fits snugly into tube. If necessary, further tighten with a wrench using the nut under the swivel. The wheel is made from a polyurethane material that is grease resistant and non-marking to help keep floors clean.