I tried the screws from this kit to fasten a long 3/4" birch plywood corner. It appeared that they should be ideal for driving through a panel into end grain, and without pilot holes. But to me,their appearance is that of very inexpensive parts, with a coarse and not well-finished surface. I found that they cammed out easily, and took a lot of force to sink and secure the joint. I did the other side with pilot holes and traditional deck screws (beautifully smooth finish, as usual) (could use square-drive bits,no cam-out)and was perfectly satisfied. It may be just me, but I won't use them again. Very disappointing.