Stabila 35240 Type XtL exact length level, expands 26" up to 40" in length based on user requirement. Designed at the request of a leading door and window manufacturer, Stabila XtL levels were created to cover more than 80% off all door and window installations. XtL expands and locks to the exact size needed for any project. Two XtL levels cover the same range as the 5-6 level sets normally carried by door and window installers. A big level in a small package - at half the length of the level it replaces, it’s compact and easy to carry. A fully sealed solid rail (six sided) extension eliminates flex and deflection, and delivers the smoothest extension movement available. One Horizontal (level) and one Vertical (plumb) vial built in. Features include a three chamber rectangular aluminum profile with reinforcing ribs, two coated measuring surfaces, and overhead (vial down) measurement capability - extendable spirit level that adjusts to fill the frame of almost any door or window installation.