Product review (5 stars): It is what it is and if you need it you know it
This is just the mounting bracket with no screws, instructions, or anything else.  Fortunately instructions are posted online and if you really need them, you can also buy the mounting diagram.  This fits various manufacturers and models of microwaves (Jenn-Air, KitchenAid, Whirlpool) and holds the microwave up if installed appropriately.  It appears to be well made for what it is and gets the job done.