In article . com,
"Bob" wrote:

No, the screw heads are completely below the surface. But this should
be a function of where you set the stop on the drill, not the jig
itself. The Kreg jig just sets the angle of drilling. They have some
guidelines and measurements that are recommended but you can adjust
them as you see fit.

What Bob said.

If a screw head protrudes, it's either not going in deep enough, or it
is the wrong screw.
The KREG people are nice enough to publish the K-3 manual on their
website which spells things out quite clearly on how to set things
up.... and that info is easily transferable to a knock-off jig. (It must
be said that knock-off jigs have a very short life-span and in no way do
the clean job of a Kreg. They're a ****-poor substitute.)