Strait-Line Intersect Laser Level Auto Leveling No Guess Work Unique Design allows access to 90 degree square laser line intersection Ideal For: Precise 90 degree project layouts Home improvement projects Interior decorating Multi-level shelving Wall & floor tile Ready. Set. Level. Remove backing position intersect laser level on surface & turn on Intersec laser level automatically levels Start project at 90 degree laser line intersection To remove: Slowly pull 3M command tab straight aling the line of the wall or surface at least 12 inches until laser level releases