Hemline Seam Guide Washi Tape Self Adhesive. Self-adhesive washi tape. 3/4 inch wide x 39 inch long per roll. Simply cut and stick on to sewing machine. No more drawing sewing lines. Use the white lines on each side for a perfect ¼” seam. Also ideal for making half square triangles. tem dimensions: 2.6 inches x 0.8 inch x 4.65 inches. CHK-193T