These little guys are the best ever for surface mount.....The 5 #8 X 1/2 in stinger screws work perfect for them...The strenght is also incredible...I use them on 50 lb. speakers and have never even come close to stressing them.
I have been dealing with MCM for over 30 years now. If I didn't like the service I'd would have found a different supplier 30 years ago. For most of my needs they are the 1st stop on my shopping list.