Glad people like them. They are so nice I had to get one myself. :-)

I should have put length information on the web site, I'll have to add that. The overall length of the knife is 8". The actual blade part is just under 4".

Yes, it is double edged. The typical sgian dubh is single edged, because it was originally a skinning knife. This is more of a dagger style, but it's a good size to wear as a sgian dubh. Looks great in the top of your hose!