Stihl: 017, 018, 19 T, 021, 023, 025, MS170, MS180, MS190 T, MS191 T, MS210, MS230, MS231, MS241, MS250 and MS251 chainsaws

Replaces OEM 1123 160 2050, 1123 160 2001
Stens 646-170

OD:  1/2"