If you are wanting to sew straight and need some help then these guides are for you. The Bernina seam guides, with built-in measurements, makes sewing straight lines a breeze. Just slide them into the back of your presser foot, set them to the width you want and off you go. Included is a right side guide and a left side guide. The measurements on the guide are in both inches and centimeters so you can get very precise with your lines.
Bernina Seam Guide With Ruler In Inches And Centimeters