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Bloc Loc’s Half-Square Triangle Set #2 contains 2 1/2″, 4 1/2″ & 6 1/2″ rulers that lock onto the seam for instant ruler placement, control so that the seam ends in each corner and trims 90% faster than a flat ruler. Ruler rock is gone, too! Also trims quarter-square triangles, birds in the air, y-blocks, LeMoyne Star, double windmill, hidden square units and much, much more. HST ruler is multi-sized and trims in 1/8″ increments.