The 10" Square Template is used to cut 10" squares and to square up 10" blocks. Diagonal lines are used to center the template to trim around unfinished blocks. The template can also be used to make half square triangles. Holes are drilled every 2" so blocking a 10" square made of 2.5" squares is a breeze. The template is made of 1/8" fluorescent acrylic and includes a 1/4" seam allowance. The template is laser engraved and extremely accurate. The template is made in the USA.