The Stanley 0-43-648 FatMax Xtreme Box Beam Level has vials magnified by 20% for improved all round visibility. Dual machined leveling surfaces for maximum accuracy. Bi-material hand grips are screwed into the frame. Rock solid box beam construction is up to 5 times stronger than other Stanley levels. Solid acrylic block vials provide best in class accuracy in 8 orientations of +/-0.5mm/m.