I needed this to properly protect the dryer 4" pipe exit from rodent intrusion, anything plastic will not stop that problem.
It is well made and looks good, mine came in white and well painted over what is supposed to be stainless steel expanded metal and more than likely is stainless but positively is metal.
Anything plastic is pure cosmetic and very little function as rats and squirrels can easily gnaw through them in minutes..
It has adequate mounting holes already drilled into it and was mounted with little trouble if any using a level and screw driver to start things and finished it off with a drill equipped with a screwdriver bit to tie in the rest of the screws.
The surface I mounted it to was tapered so bending of the mounting angle iron was done to adapt to 2 different levels and in closing this product was shipped quickly and well packaged against damage in transit and best of all the best price found after researching it on various web sites and sources.
It comes bent on a slight angle which to me seemed like help to meet various mounting positions or angles. It helped me anyway regardless.