This is an Archer 18" very high-quality laminated sprocket nose guide bar that fits Stihl models 024, 026, 028, 029, 030, 034, 036, MS260, MS290, MS291 plus many more.
The guide bar is .325 pitch, .050 gauge and uses a 74-drive link chain.
Archer Saw Chain and Archer Guide Bars are known for quality and sold worldwide!