The Ko-ken SKU 14218M is a 2-piece wheel nut socket set featuring a versatile double-ended wheel nut socket. One end is 19mm and color-coded in red, while the other end is 21mm and color-coded in yellow. The set includes an extension bar (SKU 14760ST-B) that slides into the double-ended socket, creating the usable square drive. The extension bar features a rubber bearing on the tip to prevent damage to lug nuts. The double-ended socket (SKU 14118PM) is a thin-wall lug nut socket with plastic protectors on both ends, serving as a barrier to protect the wheel well during lug nut removal.