The SavageAluminum Torpedo Level is a great & handylightweight tool perfect for contractors &electrical &plumbing professionals. Made of precision-machined, solid-billet aluminum alloy, anodized for maximum durability. The four-vial design incorporates Swansons exclusive Brightview milled vial ports that capture &reflect light for increased readability &accurate measurement of 0, 30, 45 &90 angles. Top-read viewing windows offer an easy, straightforward view of the 0 &30 vials. Laser-engraved SAE &metric rules are prominent features of both levels. Rare-earth, neodymium magnets considered to be amongst the strongest in the world have also been integrated into the levels design to provide maximum holding strength while out on the job.