This is a 18" professional laminated Archer brand sprocket nose guide bar that is .325 pitch, .063 gauge and uses a 68 drive link chain. This guide bar works on Stihl models like the 023, 023C, 025, MS192, MS193, MS200, MS210, MS220, MS230, MS250 & MS251 plus more.
Your saw needs to be equipped with a .325 pitch sprocket for this bar to work.
Archer Saw Chain and Archer Guide Bars are known for quality and sold world wide!