... 60cm6062*38*3348"/120cm60123*38*33what's the I- beam level?I-Beam levels got their name from their shape ... , you can see it looks like the letter "i". I-beam levels are made out of aluminum but their ... sturdy construction to a lighter gauge aluminum. Typically, i-beam levels are lighter than box beams levels, which ... and once the vial is loose, you will never obtain the same degree of accuracy as when it ...