These are the chain stitch accessories for Singer Touch & Sew Models 600E, 603E, 620, 625, 628, 630, 635, 636, 638, 640, and 648, and for Singer Auto-Reel Models 600 and 603

Chain Stitch Needle Plate (Throat Plate): Part #21913

Chain Stitch Thread Guide: Part #21903

Chain Stitch Bobbin Case Cover: Part #21906