This 18" Stihl ROLLOMATIC E guide bar, like the rest of the ROLLOMATIC lineup, has a sprocket nose design that brings the saw chain from the top to the bottom of the bar. This reduces wear and allows for a narrower nose design, making this guide bar perfect for jobs that require extensive use of the nose, such as limbing and boring. It's a big enough bar, however, to for most other jobs that you'd undertake with a small to medium chainsaw. | STIHL 18" ROLLOMATIC E .063" Gauge Chainsaw Guide Bar