Professional finish carpenters prefer Johnson levels with removable endcaps because you can scribe a perfectly straight line directly into a corner. Historically, this feature was only found on box levels - but Johnson has raised the bar again by offering the industry's first I-beam level with a removable endcap. To make this level as easy to use as possible, the oversized 1/2" vials come equipped with Johnson's "SurroundView" technology for maximum visibility along with a top read window allowing the user to stand over the work to view the vials. The "GripTight" non-slip end caps allow you to hold the level firmly in place with just one hand, &the large comfortable rubberized hand grips provide a comfortable, sure grip every time. Magnetic working edge allows for hands-free use on ferrous metal surfaces.