June Tailor 10x12 Perfect Half Square & Quarter Square Triangle Ruler All-in-one tool for creating perfect half and quarter-square triangles for quilting Constructed of clear flexible acrylic Has measurements starting at 1-1/2 inch and continuing to 6-1/2 inch in 1 inch increments and 45 degree angle markings Measures 12-1/2 by 10-1/2 inches