OREGON 72LGX066G 66 Drive Link Super Guard Chain, 3/8-Inch Recommended saw size: 50 to 100cc, bar length: 16 to 36-inch (41-91cm) 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 "X" grind-Enhanced grind geometry significantly improves out-of-box sharpness with substantial speed improvement in boring and bias (undercut) modes Warning: oregon 72, 73, and 75lgx super guard chains may be capable of kickback that could result in serious injury to the saw operator or bystanders