Hillman 1/4 in. X 3/4 in. L Hex Washer Head Self- Drilling Screws 100 pk

Self Drilling screws are specifically designed to fasten metal sheeting with out drilling and have self tapping threads to provide a stronger grip to your surface. These drill into the roof to remove material and have a neoprene washer provide a water tight seal. These screws have a ceramic finish that is corrosion resistant and recommended for use for treated woods. *