The Savage Swanson SVB240 24-Inch Professional Box Beam Level is the ultimate in accuracy and durability. The Box Beam Level is called such due to the construction of the frame. If you were to cut one in half, you would see the rectangular construction that gives these type of spirit levels the ultimate in durability. Features: * Continuous dual rail frame * .029 degree vial accuracy * Precision machined * Gelshock end caps * 80 percent stronger Savage strength frame * Acrylic block vials * Multi-ring vials What"s In The Box: * Swanson SVB240 24-Inch Professional Box Beam Level