A fantastic square-up ruler for quilters, sewers and crafters.  It comes in three popular sizes 6", 8", and 10".  It is easy to use with clear markings.  

Sew Square 8™ includes the following reference lines

C - Chic Picnic square-up lines, Sample 10 in pattern, page 3

D - Metro Hoops square-up lines, page 4

Sew Square 8™ also squares-up blocks in the following patterns:

Abacus Revival          Chic Shells              Chic Sisters              Chic Stars

Metro Scope              Mini Kites                Mod Citrus                Mid Lilly

Urban Abacus            Urban Beads           Urban Chained         Urban Escape

Urban Holiday            Urban Pods             Urban Window         Urban Winter

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.