XIANQI the pin of presser foot is 6MM The secret to the border guide foot lies in the red guide marks. The two sets of vertical red lines are calibrated to allow perfect spacing of rows. The horizontal red line matches the needle drop so you can line up the start of each row. The small red mark denotes the center of the design for lining up with the marking for the first row. Now the Border Guide Foot helps you to easily match up your border designs with the red lines of the foot. No need to mark every row beforehand! Help to sew parallel lines. The pin of presser foot is 6MM, for 9MM stitch sewing machine, not fit 9mm ankle's machine The sewing machine presser foot that will give you the perfect spacing between decorative stitches every time. Simply line up the red lines on the Border Guide Foot with an existing decorative stitch and you'll have perfect spacing between decorative stitches. The horizontal lines allow you to align the start of a decorative stitch, while the vertical lines help you guide the stitch. Help to sew parallel lines. Sew the first row of patterns. Align the first row between the guidelines A and B, (A is the inside line B is the outside line), and sew the next row. Align the two rows with the guidelines A, and then sew the next row. Suitable for most of domestic low shank sewing machine which with standard adapter. The pin of presser foot is 6MM, for 9MM stitch sewing machine, not fit 9mm ankle's machine. Color: red, transparent Size: the pin of presser foot is 6MM Product includes: 1x sewing machine foot