28" Chainsaw Guide Bar is 3/8" Pitch, .050 Gauge And 91 Drive Links.  

Replace Guide Bar Number 280RNDD025. 

Type: RN, Mount: SN, Oregon Mount: D025.

Fits Stihl: 3003 000 2238

Fits Models: 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, MS460, MS500i, MS660.