Product review (3 stars): screws not included.
The range of control with a 10 inch could was good, the construction was fair, the knob had a bit more play than the old one that I was replacing. The biggest issue though is the special ( very short) screws that are required to mount this device are not included.  The add did not have a picture of the mounting arrangement, this unit does not have a center mounting nut and require two small screws not included.