These Light, Completely Redesigned Professional Guide Bars Are Lighter, Stronger And Last Longer. Designed For The Highest Performance For Professional Lumberjacks. Features And Benefits • More Precise Cutting From A Stifferest Bar • Provides Better Balance On Smaller Saws • Lower Weight Results In Less Effort • Longer Life Due To Stronger Driving • Longer Tip Life And Better Performance With A New Spool Pin System • Reduced Wear Rate Of The Guide And More Precise Cut Thanks To A Better Assembly Of The Chain. The Pair Of Speedcut Guide Bars Along With The Speedcut Chain To Create The Next-generation Narrow-cutting System On Chainsaws Up To 55 Cc Displacement. Speedcut Is Designed To Provide Faster Cuts And Has A Low Weight Compared To Standard Cutting Systems. The Controlcut Guide Bars Are Standard Cutter Bars That Feature A Narrow Spoke Tip For Reduced Kickback. Recommended Dimensions Chainsaw 2.3 - 4.0 Cu. In (38 - 65 Cc) And Major