.325" 7T Clutch Drum Worm Gear Kit For STIHL 017 018 MS170 MS180 170 180 021 023 025 MS210 MS230 MS250 Chainsaw
https://www.vogueparade.com/shopping/EN/12503/1/32743211604/325-7t-clutch-drum-worm-gear-kit-for-stihl-017-018-ms170-ms180-170-180-021-023-025-ms210-ms230-ms250-chainsaw//