Guaranteed to fit Singer serger models:
14U12, 14U12A, 14U13, 14U13A, 14U234, 14U23A, 14U285, 14U285B, 14U286, 14U286B, 14U32, 14U32A, 14U344, 14U344B, 14U34(14U34B), 14U354, 14U354B, 14U44, 14U44B, 14U444, 14U444B, 14U454, 14U454B, 14U455, 14U46B, 14U52A, 14U53A, 14U544, 14U554, 14U555, 14U557, 14U594, 14U595, 14U64A, 14U65B, 14U85B

Alternate Part Numbers: 376559