FTNF-S518NF/5410NS Invisible Zipper foot for Needle Feed machines.
FTPM-S518 | Singer Invisible Zipper Foot
FTPM-S518W || Industrial Sewing Machine Invisible Zipper Foot | Wide
FTPM-SIN-S518N | Singer Zipper Foot (NARROW)
FTPM-SIN-S518S | Singer Zipper Foot (SOLID)