The Oregon 27850 Chain Saw Xtender Bar lets you tackle the tougher jobs with two extra inches of cutting capacity added to your chainsaw. Cut by cut you'll get it all done safely with the double guard bars that help reduce kickback. This 20-in. combination set includes a 3/8-in. pitch, 0.050-in. gauge saw chain that offers 70 drive links and requires a 7/32-in. file for sharpening. This extender bar set is compatible with Day, Echo, John Deere, McCulloch, Poulan, Sears, Skil, and West chainsaws.