IRWIN Tools 250 Magnetic Torpedo, 9-Inch (1794153) Die-cast aluminum level construction for extreme durability and strength B-Tank valve key provides the ability to open an acetylene tank valve without stripping Plumb Site offers dual-sided torpedo level viewing for easier and more accurate plumb readings 1.5 integrated button with a slight radius ensures the level sits securely on the pipe for easy 1/4-inch-per-foot drainage Rare earth magnets are 5x stronger than strip magnets and allow the level to be used for easy, hands-free steel construction work Die-cast aluminum level construction for extreme durability and strength B-Tank valve key provides the ability to open an acetylene tank valve without stripping Plumb Site offers dual-sided torpedo level viewing for easier and more accurate plumb readings 1.5 integrated button with a slight radius ensures the level sits securely on the pipe for easy 1/4-inch-per-foot drainage Rare earth magnets are 5x stronger than strip magnets and allow the level to be used for easy, hands-free steel construction work