4 Vials (2 Plumb, 2 Level). One-piece extruded aluminum frame. I-beam cross-section with flanged edges for increased strength. Permanently mounted acrylic vials require no adjustment. Rectangular vial sights with 360° viewing. A large magnetic strip mounted flush to the working edge on one side of the MST Series models for increased holding power. Frees hands when leveling on ferrous surfaces.
The picture shows the shape, not the exact size. Limited Quantity.