Forester 18" Bar and Chain Combo for Large Stihl Chainsaws 3/8" Pitch .050 Gauge mount Fits Stihl Models: 024, 026, 028, 029, Farmboss, 030, 031, 032, 034, 036, 038, 040, 041, 042, 044, 045, 046, 048, 064, 066 .050 Gauge 3/8" Pitch Chain. Stihl D025 Mount Fits the MS version for each model exampl 031 = MS310