Bloc Loc Half Square Acrylic Triangle Ruler, HST- 4.5x4.5 Inches

Bloc Loc 4.5'' Half Square Triangle Ruler, Acrylic Ruler. These rulers have a grooveto lock the ruler into place on your seam so there is no more slipping, sliding or rocking have a grooveto lock the ruler into place on your seam make the tough job of squaring up easy and fast Easy to read numbers and grid lines in 1/2'' increments Acrylic.