[Compatible with] Fits Stihl MS170 MS180 017 018 MS210 MS230 021 023 025 chainsaw.[Part Number] #1123-640-1705. 1123 640 1705. Based on strict standards, the specification and size are exactly the same as the old one.[Effective Protection] The sprocket cover can keep the sprocket clean and protect the chain from damage, helping the chainsaw run smoothly.[Durable Design] Made of sturdy ABS plastic, built to last.This is a non-original aftermarket part.100% brand new.Type: Sprocket Cover Kit.Note:Installation guide is not included, we strongly recommend seeking professional installation.Please check as much as possible to make sure the item is the one you need.Tips: The product may be continuously updated. Due to different batches, the actual product may have slight differences or color differences, which does not affect use.Color: As shownMaterial: PlasticPackage Contents:1 * Sprocket Cover KitOnly 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. The measurement allowed error is +/- 1-3cm.