A couple of final comments-
The included wrench is a nice touch...I know they aren't expensive, but I also know some folks don't have allen wrenches and having the wrench in there is a ++.
Finally, if you are easily confused by instructions, like I am, you'll want to read through them once or twice before you start....a couple of places may snag some people at first, but if you READ THE INSTRUCTIONS, and do them step by step, even your trained monkey can install one of these and it will function as it should.
At this price, it's a super buy. Do it now, I command you!