This dual purpose ruler allows you to mark the center of your block/strip/fabrics within a 12" span as well as easily mark your sewing lines for half square triangles. There are markings
June Tailor 10x12 Perfect Half Square & Quarter Square
Sew Easy: Trim Oversized Triangle-Squares with the Perfect
Simple Half Square Triangle Quilt - Freemotion by the River
Time-Saving Quilting Technique: Half Square Triangle Shortcuts
The quick and easy way to make perfect half-square and quarter-square triangles. The ruler has a guide to mark the sewing and cutting line. Center
Perfect Half Square & Quarter Square Triangles Ruler
Flock of Half-Square Triangles: block tutorial — 13 Spools
Create 8 half-square triangles with only 4 seams and 4 cuts. Template creates 11 sizes of half-square triangles from 1-5/8''--6-1/4'' Laser-cut
YICBOR Easy Half-Square Triangles Quilting Rulers and Template
Half Square Triangle Ruler Tutorial
PDF) Siwa Oasis _Actions for a sustainable development