Stanley fatmax i beam levelsl 3 vial stanley 1 43 555 stanley fatmax i beam level has solid block vials to provide an accuracy of 10mmm in eight orientations plus every fatmax level comes with a lifetime accuracy warrantyit is 2 x stronger than other stanley levels thanks to its unique reinforced box beam constructionlightweight body and rule scale for ease of marking out also a handgrip make handling easy and the precision engineered dual machined levelling surfaces ensure maximum acc