DeWalt 72" Magnetic Box Beam LevelThe 72" Box Beam Level offers accuracy with its block vials and durability with its large cross section and metal and overmolded end caps. Large cross section for level strength Block vials for best durability and accuracy to 0. 0005" in Magnified center vial maximizes vial readability Robust metal + over mold end caps provide excellent shock resistance Die cast center vial holder maintains level accuracy under abusive work conditions Bridged center