Fatmax® Level, Box, 48" L, Aluminum, 3, Non-MagneticSingle piece, aluminum box beam structure for durability and accuracy MaxEdge bridged center vial for continuous marking surface and durability Block vials provide maximum accuracy of 0. 0005 in. in. (0. 5mm m) 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 Type: Box Length: 48" Material: Aluminum No. of Vials: 3 Magnetic Non Magnetic: Non