Colson Caster’s new hand truck bearing features carbon steel construction. Because they are completely sealed to keep grease in and debris out there is no maintenance or lubrication required. Replacing Colson’s original styled radial ball bearing for hand trucks, the new bearing sized at 5/8" ID x 1 3/8 OD is available now with an additional version of the bearing at 3/4" ID x 1 3/8 OD coming in May.