Features and Benefits: Durable acrylic vials Impact resistant endcaps protect frame and vials Hang hole for ease of storage Top read window provides clear overhead viewing Ruled edge All metal frame to survive harsh jobsite conditions Made in the USA This level has a rugged aluminum I-Beam frame with convenient top reading windows for work that is done above the level. The end plates are beveled to protect the vials from shock if the level is dropped. Great for the contractor and do-it-yourselfer!