STANLEY 43-572 - 72" FAT MAX LevelThe FatMax 72 inch non magnetic level has an accuracy of 0. 0005 inch inch The Max Edge cover the vial for a smooth consistent level surface. A 1 piece of aluminum is used in this levels construction. Features Block vials provide maximum accuracy of 0. 0005 in. in. (0. 5mm m) MaxEdge bridged center vial for continuous marking surface and durability Single piece, aluminum box beam structure for durability and accuracy Large ergonomic rubber over molded