This is an aftermarket clutch retaining clip, suits the following model Stihl chainsaws:

Stihl 017, 018, 019T, 021, 023, 025, 026, 0290, 039, 044, 046, 064, 066, MS170, MS171, MS180, MS181, MS190T, MS192T, MS193T, MS210, MS211, MS230, MS231, MS250, MS251, MS260, MS261, MS270, MS271, MS280, MS290, MS291, MS310, MS311, MS390, MS391, MS440, MS441, , MS460, MS461, MS462, MS500i, MS640, MS660, MS661

OEM Part number: 9460 624 0801