... :GCI Z1-03A rollers, use stamping galvanized bearing, special non-standard roller bearings,with charicateric of heavy load, rotation and flexible. It ... can be used for non-powered roller, heavy duty rack slides lines.Types: GCI Z1-01A, GCI ... -03-ASpecification: Gravity Rollers 1.GCI Z1-01A Dia.of Roller (D)Shaft Dia.(d)Pipe Thk.(t)Length (L)Material ...