Sew Square 4™ is a 4" x 4" clear acrylic ruler with easy to use black lines and marks. Sew Square 4 has unique marks for squaring-up 4" x 4" units from multiple Sew Kind of Wonderful patterns.
Patterns that have 4" square-up steps include:
Posh Holiday Series
Wonderful Curves Sampler Book
Floral Felicity Sampler Book
Mini Wonderful Cur