2-In-1 Extendable Layout Tool features a 6 In. fold-out extension arm that eliminates the need for carrying both a 7 In. and 12 In. 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. Acts as a continuous edge for scribing and marking large scale lumber. Lightweight and easy to store in your work pouch or pocket.