The 91px Is Ideal For Home Maintenance And Occasional Use, For Users Who Want A Reduced Vibration And Kickback Chainsaw. The Double Cutting Angles Of The Chamfer Chisel Guarantee Extraordinary Performance. They Are Durable, Easy To Maintain And Safe Compared To Round Corner Chains. The Anti-rebound Connection Link In Combination With The Delimiter Of Depth, Guarantees A Reduced Recoil And High Performances. Features & Benefits • Lubritec ™ Keeps Your Chains And Guide Bars Oiled, Ensuring Less Friction And Longer Life.