LEVEL ALUM 48" MAGNETIC I BEAM. This durable, lightweight extruded aluminum grade is a great choice for many different jobs. It features a heavy-duty heavy-duty beam frame and a full-length magnetic edge that ensures versatility and works on metal structures. It also features a set of three solid bottles that include a level and two plumb levels for leveling from different angles. These bottles, in turn, feature permanent lines that won't fade or wear out and have 0.0004 accuracy per inch. In addition, it offers large holes for the hands providing comfort and ease when moving the level.