reliability Replacement: Acts as a perfect substitute for old or worn out tensioner screws, maintaining optimal tool for professional users Visual Consistency: Black color matching most chainsaw equipment, providing a cohesive look under various lighting conditions for aesthetic conscious users Durability Carbon Steel: Made from high strength carbon steel for excellent wear resistance and rust protections, ideal for outdoor use and prolonged durability : Features a finely designed chainsaw tensioner screw for accurate chain, reducing risks from loose chains and ensuring cleaning cut Wide Compatibility: Designed to fit 4500, 5200, and 5800 model chainsaws, ensuring perfect compatibility for 45CC, 52CC, and 58CC chainsaws for easy replacement and repair, Manufacturer: Beimus