A lawn mower has a base member that provides protection frames around a blade assembly and height-of-cut control for a lawn. The base member contains a connection piece having lateral edges configured with a notch for configuration of the base member onto the blade assembly in two perpendicular orientations. The base member also contains front and back tubes for detachably connecting to the protection frames in an adjustable manner to cover the revolving range of the blade assembly. Wheels are rotatably configured on the protection frames so that the lawn mower can be moved around the lawn.
