T-Square rulers are great for lining up card and marking score lines for fancy fun folds.  Save time and less mistakes when you align the t-square ruler on the edge of your card.  Also very useful when aligning photo mats on scrapbooking layouts and for spacing sentiments equally.

2 handy sizes to choose from.

You'll find yourself reaching for this tool on a daily basis.  Clear acrylic for ease of use.