: The handle is constructed from hard plastic for maximum strength and longevity. It removes normal wear and minor damage to restore the bar rail to a 90degree square edge. Safe & Effective: This chainsaw bar dressing tool provides a quick and easy method to sharpen the saw chain while protecting your hands; you don't need to touch the whetstone and you can restore the chain in seconds. Lengthen Your Chainsaw Life: Use the tool to clear away burrs and level the bar rail to reduce rail chipping and prevent the bar from knifing. This supports longer chain life, better chain lubrication, more precise cutting, and increased safety. Easy to Use: Redress your chainsaw guide rails to 90 degrees to keep the chain cutting straight. Run the file perpendicularly to the bar and use it in various positions, dressing the outer or the of the rails. Chamfer the edges of the guide bar and redress the rails at 90 degrees. Practical Use Scenarios: During field work after heavy use to restore straight cutting and reduce wear. Onsite maintenance during logging, pruning, or firewood processing to extend chain life and improve safety. Preseason or postwork storage to keep the guide rails square and ready for efficient cutting.