Features Strong holding magnetic edge allows hands free use on ferrous metal surfaces Lifetime guarantee Maximum accuracy Oversized 1/2" diameter vials are easy-read Heavy duty aluminum frame assures durability and accuracy Ergonomic cushioned hand grips SurroundView® vials reflect ambient light for easy-read Top-read window maximizes readability Field replaceable cover plates and vials Shock absorbing end caps protect frame Specifications Type: I-Beam Length: 24" Quantity: 1