I would not recommend these screws for extremely dense hard-woods. Even predrilled holes at the proper shank diameter, large enough for only the threads to catch the wood still pose the potential for twisting the screw heads off. I then went to Lowes for what I needed. This has been the only product I have had an issue with from Stew-Mac. Thanks.
This was the only screw that fit on Epiphone neck mounting, here in Brazil I just didn't find. They work fine.
They are kind of soft and they bend easily. As important as they are I would gladly pay a little more for Stainless Steel screws. Problem is this is all I can find from anyone.
I am amazed of how the previous reviewer managed to break such a big screw. Use wax or soap on your screws and you'll never break even a tiny one. Quality screws for me, never had a problem.
Don't buy them! I have broken of 3 of them in the same guitar!