Based on STIHL’s many years of experience designing guide bars and chains, the STIHL ROLLOMATIC® G is a guide bar that is designed for the professional application of concrete and stone cutting. The bar requires no bar oil —it uses water and features internal water channels that are directed toward the cutting area. This delivers optimal cooling and debris flushing of the chain and sprocket nose. The bar also features an additional tensioning hole to further increase chain tensioner travel. The expected service life of the STIHL ROLLOMATIC® G guide bar is equal to the service life of two to three STIHL Diamond Abrasive 36 GBM chains. Available in 12 inch and 16 inch sizes. Applications: This guide bar is to be used exclusively with the GS 461 STIHL ROCK BOSS® concrete cutter and the STIHL Diamond Abrasive Chain 36 GBM; this guide bar is NOT to be used with any other STIHL products, including chainsaws. The bar is designed to cut concrete, reinforced concrete (with rebar up to ½ inch), cinder blocks, and masonry (including bricks, asphalt, and soft stone such as sandstone).