Diagonal Seam Tape
Diagonal Seam Tape is simply washi tape that is placed on the front plate of your sewing machine to act as a guide while you are sewing diagonal seams. The red line in the center is aligned with the needle of your machine, and the black lines on either side are 1/4" to each side from the center of the lines, to represent a 1/4" seam allowance. The black lines won't replace a piecing foot with a perfect 1/4", but act as an extra guide. The tape removes cleanly, but I recommend removing or replacing the tape often or after each project to avoid any residue on your machine. This tape is not meant to be a permanent fixture on the machine, and long term use without replacement may result in some residue to clean off.