The STIHL ROLLOMATIC® ES Light guide bar has up to 30% less weight in comparison with STIHL ROLLOMATIC® E Super guide bars. In order to reduce weight; long channels are milled out of the center of a solid guide bar, then a thin steel plate of the same steel is welded over the channels using a special laser welding process. The reduced weight helps decrease operator fatigue, especially on longer bars. A replaceable sprocket nose assembly is also incorporated in the nose of the bar that carries the saw chain from the top to the bottom of the bar. This not only reduces wear, but also enables the bar nose to be made considerably narrower. All STIHL ROLLOMATIC® bars designed with a narrow nose help reduce kickback tendencies. And the sprocket nose assembly can be replaced several times before the whole bar is due for replacement, increasing the guide bar’s service life. Applications: For high performance wood cutting with larger displacement professional STIHL chainsaws. If you need assistance with finding the correct chain, please use the Saw Chain Selection Guide Note: The actual listed guide bar length can vary from the effective cutting length depending upon which powerhead it is installed.