The phrase "long screws" refers to screws that are longer than usual or longer than the ones you might typically use.
Sentences with «long screws»
He found a stud in the wall, bought a few three inch long screws, and actually screwed the dresser itself into the wall. (clothdiaperaddicts.com)
Do note however, that I had to go out and buy longer screws for the ones I used for the drawers. (ikea.com)
I thought the two top windows would be a problem but my nephew came in and just used long screws to attach them together and to the base. (craftsalamode.com)