Oregon Chain Saw Chain for Remington RM5118R Rodeo 18-Inch Gas Chainsaw(2072) Micro-Chisel cutters have small-radius working corners for excellent performance and ease of maintenance "X" grind - Enhanced grind geometry significantly improves out-of-box sharpness with substantial speed improvement in boring and bias (undercut) modes Patented Chain Steel - OREGON OCS-01 steel is patented and provides greater durability, especially in cold cutting conditions Blued Cutters provide superior corrosion resistance and improved strength Top-plate witness mark makes accurate sharpening easier