ISE&reg; Chainsaw Chain replaces Stihl Chainsaw Chain- 26RS68- 18 Inch, 68 Drive Links, .325 Pitch, .063 Gauge Highest Quality made in USA. Highest quality replacement chain replaces Stihl Chainsaw Chain- 26RS68- 18 Inch, 68 Drive Links, .325 Pitch, .063 Gauge