General description The Sprocket cover with chain tensioner is designed for STIHL chainsaws, specifically models MS170, MS180, MS210, MS230, MS250, 017, 018, 021, 023, and 025. This 6-in-1 package includes a sprocket cover, chain tensioner, two nuts, and two bolts, making it a comprehensive solution for maintaining your chainsaw. Technical specifications OEM number: # 1123-640-1705 Material: Sturdy ABS plastic Compatibility and accessories Compatible with STIHL chainsaw models: 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230 Package includes: Sprocket cover × 1, chain tensioner × 1, nut × 2, bolt × 2 Installation Replacing parts is quick and easy, allowing for efficient maintenance of your chainsaw. Usage The sprocket cover effectively keeps the sprocket clean and protects it from damage, ensuring that the chainsaw runs smoothly.