Sew Square 10™ is a 10" x 10" clear acrylic ruler with easy to use black lines and marks. 

Sew Square 10™ includes the following reference lines:

E - Metro Rings, Rings Revival, and Double Rings square-up lines for setting triangle seams.

Sew Square 10™ also squares-up blocks in the following patterns:

Chic & Jazzy             Curve It Up              Deco Tic Tac            Deco Tumbler  

Lattice Revival          Metro Lattice           Metro Medallion       Metro Waves

Mod Pineapple         Urban Birthday         Urban Candy           Urban Nine Patch

Urban Tiles               Double Starburst      70 & Sunny              Posh Snowball

Sew Square™ rulers can easily be marked with a permanent marker (ie: Sharpie) for other patterns and other square up points. Marks can easily be removed with a little nail polish remover.