Symmetrically designed for reversible use and a longer life, the Oregon 37977 Replacement Bar and Chain Combination brings quality and strength to your chainsaw. Featuring an exclusive cradle-nose sprocket for better chain support, this combination set keeps your saw running efficiently. Quality crafted from alloy steel, this 20-in. lightweight set includes a 3/8-in. pitch, 0.050-in. gauge chain with 70 drive links that requires a 7/32-in. file for sharpening. Compatible with Craftsmen, Echo, McCullough, and Poulan chainsaws.