RV Designer Bubble Level Stick On 2in x 1in. Use the bubble as a leveling guide. When the bubble is perfectly centered between the two lines that means the surface is level. If the bubble is closer to one line than the other then the surface is not level. The E407 Bubble Level features a peel and stick application. The dimensions of this level are 2" by 1". There are two stick-on levels per package. Features of RV Designer Bubble Level Stick On 2in x 1" Ensures surfaces are evenly horizontal or vertical Peel and stick application Use the bubble as a leveling guide When the bubble is perfectly centered between the two lines that means the surface is level Dimensions: 2" x 1" Package Contents: RV Designer Bubble Level Stick On 2in x 1" RV Designer E407: Bubble Level Stick On 2in x 1in