Stihl 33RS3-72 20-inch Chainsaw Chain 3/8 Pitch, .050 Gauge, 72 Drive Lengths Fits Stihl Chainsaw Models 038, 041, 046, 066, MS311, MS391, MS362, MS440, MS441, MS460, MS461, MS660 Genuine Stihl Chainsaw Chain Please Check Your Stihl Bar to Verify Correct Chain 3/8 Pitch, .050 Gauge, 72 Drive Lengths