Seachoice Phillips Oval Head Tapping Screws - #10 x 1/2" - 00803. Versatile Marine-Grade Screws for Reliable Fastening. The Seachoice Phillips Oval Head Tapping Screws, #10 x 1/2" - 00803 offer strong holding power and a polished, slightly raised finish that's ideal for marine and general-purpose installations. These screws are designed to cut their own threads in materials like fiberglass, wood, or plastic-making them a go-to choice for DIYers and marine professionals alike.. With corrosion-res