SPROCKET SPROCKET COMPATIBLE WITH MODELS: 017 018 019 021 023 025 MS210 MS230 MS250 MS250C .325" 7 TEETH INNER BOWL: 66mm Ø: 13mm Overall height: 23mm SELF-ALLINATING RING: 11892 ROLLER CAGE: 37325 STIHL CODE: 100961X ORIGINAL CODE: AT