General description The Chain Sprocket Cover with Chain Tensioner is designed for various STIHL chainsaw models, including MS170, MS180, MS210, MS230, and MS250. This comprehensive kit includes a sprocket cover, chain tensioner, nuts, and bolts, ensuring you have everything needed for a quick and easy replacement. Technical specifications OEM number: # 1123-640-1705 Material: Durable ABS plastic Compatibility and accessories Compatible with STIHL models: 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230 Package includes: Sprocket cover × 1, chain tensioner × 1, nut × 2, bolt × 2 Usage The sprocket cover effectively protects the sprocket from damage and keeps it clean, ensuring smooth operation of the chainsaw. Replacing the parts is straightforward and can be done quickly.