Tri-Recs Tools are thick and sturdy so they will stand up to years of wear. This 2 piece set makes it easy to make triangles within squares and divided rectangles. Also includes an instruction booklet. Includes one 6 by 6-3/4 by 6-3/4 triangle with 1/4 seam allowance built in and one 6-1/2 by 3 by 6-inch rectangle with 1/4 seam allowance built in.