S4GA Star style Inner Profile Tube with drill hole. Profile tube is Rilsan coated (Rilsan coating is a Teflon like coating that creates a low friction surface which reduces thrust loads. S4ga profile tube has a 51 mm O.D., 1000 mm length. Used with S5 outer profile tube. Replaces Walterscheid No. W333336. Fits Vermeer Disc Mower: RC9120; Walterscheid WWE & WWZ Series.