Stanley FATMAX 72-inch Box Level (43-572)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 hand grip Shock absorbing end caps hold up to heavy use Non marring side bumpers helps prevent damage to finished surfaces