6 in. fold out extension arm eliminates the need for a 7 in. and 12 in. sq. 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. Aluminum finish reduces heat retention while working on roofs or in other extreme conditions. Extends from 6 in. to 12 in. square.