Brother Seam Guide SG1 (Cat C).
Horizontally adjustable seam guide. Guides fabric with an accurate 1/4 inch (6.5mm), 1/2 inch (13mm) or 5/8th inch (16mm) seam.
Screws on to needle plate for accurate seam measurement while sewing. Engraved measurement markings. Screws on in front of all Brother presser feet for expanded visibility.
For Brother Category C Sewing Machines.