This series of levels has been engineered for contractors that work with brick and block and prefer to touch or hit the level with their trowel etc. Through the two patented strike zones, any out-of-line bricks can be adjusted with taps of a trowel. Added to this the hand grips on the 36in and 48in lengths make for easy handling. The tough reinforced aluminum frame precisely aligned with the STABILA locked vial system is the guarantee for accuracy on any harsh building site.