Irwin 1794079 2000 Series Box Beam Level 72", AluminumHighlights: Length: 72" Continuous Edge increases level durability ensuring accuracy over time, protects center vial, and allows for continuous scribing. Plumb Site offers dual sided, undistorted viewing in the plumb position and easy, more accurate plumb readings. Retractable end caps allow for scribing into and through corners, increasing work efficiency. Cancer and Reproductive Harm www. P65Warnings. ca. gov.