The DeWALT 9 in. Torpedo Level has an extruded aluminum body for strength and durability. It also features rare Earth magnets and a V-Groove base for use on metal and rounded surfaces. The DeWALT 9 in. Torpedo Level has a magnified center vial for readability whenever you need it. The rotating vial is great for identifying & duplicating angles, slopes and pitch. This durable and reliable DeWALT 9 in. Torpedo has a limited lifetime warranty. Extruded aluminum body for strength & light weight Solid block vials for durability & accuracy (0.0005 in./in) Rotating vial for identifying & duplicating angles, slopes and pitch Magnified center vial for readability Over-molded rubber end caps give the torpedo level shock resistance Top and bottom milled utile surfaces for accuracy Rare Earth magnets and V-groove base for use on metal & rounded surfaces Limited lifetime warranty