Material: 304 stainless steel
Surface treatment: galvanized
Size:
Self-drilling tapping screw-M4.8*25
Rubber gasket-M4.8*14
Inner diameter: 14mm/1/2inch
Outer diameter: 6.3mm/1/4inch

Easy to use: with sharp screw tip, help save time and effort.
Bonded neoprene gaskets provide a leak-proof seal, making these screws ideal for roof or siding applications.
These screws drill their own holes to prevent you from pre-drilling. Hexagon washer head roof screw with EPDM gasket seal to seal roof panel to screw to prevent leakage.
High-quality screws look great and perform better.