The Janome Acufeed Straight Stitch Foot STD is often used on very fine or very heavy fabrics.
This particular foot is flat on the underside to provide an even pressure against the feed dogs and it has a round needle hole which offers the benefit of more support around the needle to prevent skipped stitches and puckering.
It must be used in a centre needle position.
For Janome Top Loaders Category D :- ATELIER 9, ATELIER 7, ATELIER 6, ATELIER 5, CM7P, MC15000, MC14000, MC12000, MC9900, MC9850, MC9450, MC9400, MC8900, MC8200, MC6700P