4-needle, 6-thread, used for closing or reinforcing the seam of 2 pieces of fabrics that have not been over edged, such as closing for crotches of briefs, underwear etc.
NY500-04CB 4-Needle 6-Thread Interlock Seaming Machine

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4-needle, 6-thread, used for closing or reinforcing the seam of 2 pieces of fabrics that have not been over edged, such as closing for crotches of briefs, underwear etc.