Patchwork,  1/4" seam allowance foot is an excellent sewing foot for any quilting project.
A straight stitch foot, but will allow small zig-zag stitching.
This foot has markings on the toes helpful in matching corners.
The build in guide is great for top stitching also.
This is an aftermarket accessory that is not made by Bernina, and is very good quality. Good product for the right price.
Please  make sure that your machine is the right type for this particular foot.
This is OLD STYLE foot.

Fits the following models of Bernina
1530 & 1630

1200 Series models.....
1230, 1260

1100 Series models.....
1120, 1130

1000 Series models.....
1000, 1001, 1004, 1005, 1006, 1008, 1010, 1011, 1020, 1030, 1031, 1080, 1090

900 Series models.....
900, 900E, 910, 910N, 930, 931, 932, 940, 950

800 Series models.....
800, 801, 801s, 802, 802s, 803, 803s, 807, 808, 809, 810, 811, 811s, 817, 818, 819, 830, 830e, 830H, 831, 832, 840, 841, 842, 850

700 Series models.....
700, 707, 708, 709, 717, 718, 719, 730, 731, 732, 741, 742, 744

600 Series models.....
600(not deco), 610, 614, 640-2, 642-2, 644

500 Series models.....
530, 530-2, 531, 532, 532-2, 534, 540, 540-2, 542-2

Thank you