airhog1391,
The tailboom screws are 4mm and the stab screws are 3mm. Match up the lengths with the supplied nylon screws, I think they are 25mm but I can't say for sure. I know some have glued the booms, and/or stab, and/or wings, but I would rather have the option to dismantle everything for maintenance and/or repairs. I had a mishap with the safety fence at our field and the repairs were much easier with the pieces taken apart.