The Tri-Recs Tools set includes one 6″ x 6-3/4″ x 6-3/4″ triangle and one 6-1/2″ x 3″ x 6″ triangle both with 1/4″ seam allowance built in. This 2 piece set makes it easy to make triangles within squares and divided rectangles. These tools are made from thick and sturdy material so they will stand up to years of wear.