[Compatible With] Fit for Stihl MS170 MS180 017 018 MS210 MS230 021 023 025 chainsaw. [Part Number] #1123-640-1705. 1123 640 1705. Based on strict standard, the specification and size are exactly the same as the old. [Effective Protection] Sprocket cover could keep the sprocket clean and protect the chain wheel from damage, helping the chainsaw run smoothly. [Durable Design] Made of sturdy ABS plastic, built to last. This is the Non-original aftermarket part. 100 . Type:Chain Sprocket Cover kit. Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 1 * Chain Sprocket Cover Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.