Stanley fatmax i beam levels 3 vial stanley xtht1 42131 stanley fatmax i beam spirit levels have a lightweight aluminium frames that feature a thicker and taller cross section for 3 times the strength of regular spirit levels they have shock resistant over moulded end caps for increased durabilitysolid block vials increase durability and are accurate to 05mmm the profiled top provides improved precision ideal for measuring pipe workstanley fatmax i beam level xtht1 42131 60cm 24 inch