Size #8 (.183" Thread Diameter) .320" Head Diameter, #2 Square Drive, 5/64" Pilot Hole All packs are custom labeled and individually heat sealed by Marine Bolt Supply All screws listed are made of quality standard type 18-8 stainless steel Type 18-8 stainless steel bugle style deck screws have good chemical resistance and are commonly used with treated (arsenic-free) lumber. The bugle style offers a curved neck that sit flush into the material providing a nice finished appearance. These screws have a type 17 auger point that penetrates softwood and plastic-wood composite decking material. They may be mildly magnetic and length is measured from the top to bottom.