The Spec Ops Box Beam Level with Bungee features a Patented Tourniquet Bungee System that securely mounts the level to plastic pipes, 2x4s and other surfaces. Manufactured with box beam style aluminum construction and then precision milledfor elite durability, this level also features three 33% higher visibility epoxy-locked acrylic block vials that deliver an accuracy of 0.0005"/inch and offer guaranteed lifetime accuracy. The 2% slope lines were also added to help you do more with less.