Easy To Use: Attach The Chainsaw To The Sharpener Holes, Close The Sharpener And Push The Lock, Then Gently Squeeze The Chainsaw Until It Touches The Sharpening Stone. Compact Portable: Made In Made From Quality Plastic Material, Durable And Sturdy. Compact Size And Lightweight, Easy To Carry For Outdoor Use. Wide Compatibility: Suitable For 14-20 Inch Chainsaw Bar. Designed With 2 Pins On The Chainsaw Sharpener To Fix The Chainsaw Bar. Quick Chainsaw Sharpening - Helps You Easily And Quickly Sharpen The Saw Chain Without Touching The Whetstone. Just Press The Chainsaw And It Will Be Sharpened In Seconds, Safe And Fast. We Provide The First Customer Service For Products. If You Have Any Questions, Feel Free To Email Us.