This foot mimics a serged/overlock effect in that it prevents raw edges from fraying by wrapping thread around the edges.
High-Quality Overcasting Foot XC3098031 (Ocf)
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Invisible Concealed Zipper Presser Foot Attachment for Brother Sewing Machine - Hong Kong
Narrow Zipper Foot - Juki F, NX, DX Computerized Models - Juki Junkies