For MS311 MS391: Specifically designed for the MS311 and MS391 chainsaws with part number 1140 792 9101, this hand guard provides a precise and secure fit for seamless integration with your outdoor power equipment. Enhanced operator safety: This electric saw part provides a protective barrier for the user's hands, helping prevent contact with the moving chain during operation and reducing the risk of injury. Long lasting construction: Crafted from robust plastic materials, this chainsaw hand guard is built to withstand the rigors of frequent yard work and garden maintenance, delivering reliable performance over time. Simple installation process: Featuring a straightforward design, this MS391 hand guard can be quickly and easily installed onto your chainsaw, enabling hassle setup without requiring special tools or expertise. Use scenario: While pruning and trimming trees or shrubs, the guard keeps hands away from the chain for safer cutting in tight spaces. Use scenario: For routine yard maintenance and debris cleanup, including brush clearing and storm cleanup, providing reliable protection during extended chainsaw use. Use scenario: In regular garden upkeep or professional property maintenance, where frequent chainsaw operation benefits from a secure, easytoinstall hand guard.