that bottom mount hole or this one right here has a protective cap that goes over it. the unit itself is made from a sturdy steel construction.
it's also going to feature rust resistant, white, powder coat finish.	taking a look at some measurements real quick, the overall length, measuring edge to edge, so from this point here to this point here gave us a measurement of about 6 1/4 inches. just the body, so from this point here to this point here, that measures right on 6 inches. the width, this area, 2 3/4 and then the width at the widest point is 3 1/2, and then the overall thickness, from 