I bought this to replace the old soap dispenser on our kitchen sink, which had worn out and for which I couldn't find a replacement pump mechanism that fit. Very easy to install. I just twisted the old one with a pair of ChannelLock pliers, which loosened the nut under the sink enough to remove it. After cleaning the built-up gunk from around the hole with a putty knife, I popped in the new soap dispenser, crawled under the sink and attached the large plastic wing nut that holds it in place, screwed on the plastic bottle, filled it with a soap solution (I use about 1 part liquid detergent to 2 parts water), dropped the pump into the hole, and voila! Each push squirts out about a teaspoon of soap solution, and unlike the old one, it doesn't lose its prime between uses.
True, the part that goes through the sink and the nut that holds the unit in place are plastic, or perhaps nylon of some sort, but it seems quite strong and durable. The exposed part is apparently enamel- or plastic-coated brass -- heavy and obviously strong -- and it looks great, with clean lines and not obtrusive. I expect it to last for years -- and if not, what the heck, it was only $35 from Amazon.
BTW, don't be concerned about the term "for Thick Tile" in the name of this product. Apparently that means the part that goes through the hole is longer than normal (it's about 3 inches long, whereas the same part on my old unit was only about 1 inch long), which allows it to be used with holes cut through granite or other thick counter tops. However, it works equally well with a normal sink -- you just have to tighten the nut a few more turns.