IRWIN Tools 2550 Magnetic Box Beam and Door Jamb Level Kit, 78-Inch / 32-Inch (1794074) Thick-walled high-grade aluminum frame provides extreme durability and resists jobsite wear and tear. Continuous edge increases level durability to ensure accuracy over time, protects center vial bubble, and allows for continuous scribing. Plumb Site offers dual-sided, undistorted viewing in the plumb position and easy, more accurate plumb readings. Rare earth magnets are 5 times stronger than strip magnets and allow for easy, hands-free steel construction work.