These steel screws are zinc plated to resist corrosion in wet environments.

These metric screws have a triangular shank that presses tightly as it forms threads, so screws resist loosening in soft metals such as brass, aluminum, and copper.

Also known as Tap-Flex screws, these are made from hardened steel to penetrate hard material. They have a five-edged shank that presses tightly against the material to form threads and resist loosening.

A rubber O-ring under the head creates a seal that withstands liquid and gas pressure.