StraightStitch Guide: Diagonal Seam Basting Tape for Perfect Sewing Alignment This diagonal seam tape is a simple washi tape designed to be placed on the front plate of your sewing machine, serving as a guide for sewing diagonal seams. It features a red stitch line with seam allowances on either side, allowing you to sew straight diagonal seams without marking lines. The tape is easy to remove and should be replaced regularly to prevent residue buildup. To use, align the red line with your machine's needle, with black lines on each side representing a 1/4 inch seam allowance. The package includes two rolls of this sewing basting tape. Please note that manual measurement may result in slight size variations, and colors may differ slightly due to screen differences. Keep out of reach of children due to winding risk.