The Stanley FatMax FMHT42400 48" Premium Box Level (Non-magnetic) features a magnified center block vial for easy readability. This premium level offers block plumb vials for accuracy of 0.0005"/in., with an enlarged vial housing for brighter lit vials. The removable end caps allow for flush and accurate markings when precision counts. This level also has a fold out rafter hook which is designed for an on-site convenient storage solution.