I got the set as a starter set for the K3 Master Hole Jig System that I purchased at the same time. The set seems to fit the bill exactly as I had expected. There is an obvious oil treatment on the screws as it has completely soaked the description lab on the inside of the lid. I think I will be cleaning/wiping the screw before use but I suppose that is better than having them rust before I can use them. From here I will just refill this set as needed or add different screws as needed. I do like the case as it is a very good way to carry the very sharp screw.
Unless you already know exactly the widths of boards you will be joining the with the Kreg system, this is a perfect starter kit. Just enough variety to get you going with any project. The screws that come with the K3 master system are hardly enough to complete even a mid sized project. This is the best way to get right into the game with your pocket hole jig.
So far they have been pefect. No defective screws. No burrs or damaged threads. No sheared heads. Perfect fit with the square bit every time.
Also, I was skeptical about the "self-tapping". I am a predrilling fanatic. But, so far so good. Not a single split piece of wood. Now I'm a believer.
The screws do come coated with a light oil film, (probably to prevent rust). Just have a paper towel on hand if it bothers you.
The case is well made compared to other cases I've used in the past. This gives the impression it will hold up for a few years as long as I don't do anything dumb. I'm usually skeptical of plastic storage cases, but this one is sturdy enough, and snaps tight.