【Compatible With】 Tronç STIHL series machine 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230, MS250. 【Package Includes】 1 × pinion, 1 × clutch, 1 × pinion bearing, 1 × gear worm screw, 1 × washer, 1 × clip in E, 1 × spark plug. 【Easy to install; 【Install】Each replacement part perfectly matches with your device. the original, installation and replacement work will be quick and easy. 【 【Part Number】 Spur Gear 3/8 LP pitch: # 1123 640 2003 and 1123 640 2073. Clutch assembly replaces: # 1123 160 2001. Gear auger replaces: # 1123 640 7102. Product description We are committed to provide to every customer high quality products. and friendly customer service. To ensure compatibility with your device. of the item, please compare your original with our photos, and check the details. Compatible with Chainsaw Parts: For STIHL 017 018 021 023 025 MS170 MS180 MS210 MS230 MS250 Chainsaw Fit for OEM Spur Pitch Sprocket #‿ 3/8 LP 1123 640 2003, 1123 640 2073. Clutch assembly: 1123 160 2001.Worm