VEVOR Rail Mill Guide System, 9 ft Milling Guide, 4 Crossbar Kits Chainsaw Mill Rail Guide, Aluminum Adjustable Saw Mill Rail System Work with Chainsaw Mills for Builders and WoodworkersProduct Features Stable & Sturdy VEVOR 9 ft mill guide boasts a robust and durable framework, secured by the connection of anti loosening nuts and large washers. Four cross beams have been added for better reinforcement, ensuring smooth and stable sliding of your chainsaw and creating a fast and stable cutting. Industrial grade Material Our rail mill guide is made of high quality aluminum and iron materials, highly wear resistant and rust resistant.