The BTI range of advanced screws and fixings from Germany cover the full range from plain old excellent through to downright brilliant. All are designed intelligently with the aim of making your work faster, neater and stronger.
They are not the cheapest, but if you are an 'if the job is worth doing, it's worth doing right' sort of person (or one who has experienced the frustration of using cheap screws) then the advantages of using high quality German engineered fixings will be self evident.