Chainsaw Chain 20 Inch for Echo, Husqvarna, Craftsman, Poulan .325 Pitch, 78 Drive Link, .50 Gauge, High Kickback Replacement chain for Echo, Husqvarna, Poulan, Sears Creaftsman and more For 20 inch bar 78 drive link, .50 gauge, .325 pitch Avoid to cut 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