MS017 018 CLUTCH DRUM SPROCKET 1.fits 017, 018, 021, 023, 025, MS170, MS180, MS210, MS250 chainsaw models 2.Sell good ... NEW CHAIN CLUTCH SPUR SPROCKET that fits 017, 018, 021, 023, 025, MS170, MS180, MS210, MS250 chainsaw models. •Replace part number ... ready to serve you by 24 hours! MS017 018 021 023 CHAIN SAW CLUTCH DRUM SPOCKET