HST 1.5" x 1.5"

Bloc Loc 1.5'' Half Square Triangle Ruler, Acrylic Ruler. Get this Collec tion for all your  Half Square Triangle Projects.These rulers have a grooveto lock the ruler into place on your seam so there is no more slipping, sliding or rocking.  have a groove to 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.