Product review (5 stars): works great
I have used these in the past and they are extremely strong.  Very useful for making large assemblies that break down easily...Careful not to place them too close to the edge of a board or the drilling jig will not be as easy to use.  Designed for 3/4" plywood or other panels, I have used them successfully on 1 1/2" thick rail and stile assemblies.  It is smart to put one to the left on one side and another on the right on the other side...this balances out the force  (for thick wood)