Crescents full line of squares is ideal for the professional tradesmen who get the job done at all costs, with longevity and an investment in their craft. Equipped to perform in a variety of environments, Crescent squares allow you to easily complete multiple tasks. And with advanced design features that provide durability and maximum functionality, Crescent squares outlast the elements. In grit, dust or tough territorytheres a square for your unique application. 6-inch fold-out extension arm eliminates the need for carrying both a 7-inch and 12-inch square Quick access thumb lock releases the fold-out extension and locks it back into place after use Solid aluminum construction and corrosion resistant finish for durability Laser-etched markings for visibility and durability Lightweight and easy to store in your work pouch or pocket