An attachment that uses a magnet to fix to the needle plate of a sewing machine, allowing you to sew with a consistent seam allowance. Great for hemming and sewing cuffs too! Sew straight lines and curves beautifully! This is a magnetic sewing machine guide! One of the worries of sewing beginners is "I can't sew straight." Even those who are more experienced, haven't you ever had the experience of the seams coming undone just by relaxing a little? Can be used with both electric and manual sewing machines. The size, etc., is shown in the photos. Will ship immediately.