Bloc Loc HST 3.5" RULER
BLOC LOC. Bloc Loc HST 3.5" RULER. Ruler has a patented grove that hold your seam for accurate trimming. Trimming sizes from 1" x 1" to 3 1/2" x 3 1/2", with 1/2" lines. Recommend Half-Square Triangles & Beyond Volume 1 and Volume 2 for more block ideas.