This is a 24"Archer Professional Solid Steel Guide bar that fits Stihl. The bar is 3/8 pitch, 050 gauge and uses an 84-drive link chain. This bar fits Stihl models like the 024, 026, 028, 028S, 029, 030,031, 032, 034, 036, 039, 040, 041, 042, 044, 045, 046, 048, 056, 064, 066, MS270, MS270C, MS270CQS, MS271, MS280, MS280C, MS280CQS, MS290, MS291, MS310, MS311, MS341, MS360, MS360 PRO, MS360QS, MS361, MS361C, MS362, MS390, MS391, MS400, MS440, MS441, MS460, MS350, MS500i, MS660, MS661, FARM BOSS Replaces part number 3003 000 4030 and Oregon guide bar part number 240RNDD025.