Chainsaw Chain 18 Inch for Stihl .325 Pitch, 68 Drive Link, .63 Gauge, Low Kickback Replacement chain for Stihl For 18 inch bar 68 drive link, .63 gauge, .325 pitch Avoid cutting into dirt, concrete and any metal materials For professional use and the ones who have experience to use chain saw only Design to cut wood/trees only. Always keep saw chain right tension