This 48" Irwin 2550 Magnetic Box Beam Level (1794068) is constructed with a thick-walled high-grade aluminum frame that provides extreme durability and resists jobsite wear and tear while the Continuous Edge increases level durability ensuring accuracy over time, protects center vial and allows for continuous scribing. Plumb Site offers dual-sided, undistorted viewing in the plumb position and easy, more accurate plumb readings. Over-molded rubber end caps provide shock-absorption, protecting the level's accuracy upon impact, and are removable for accurate leveling into corners. Rare earth magnets are 5X stronger than strip magnets and allow for easy, hands-free steel construction work.