HEAVIER&THICKERWhen the quantity and model are the same,Our screws are heavier;zinc coating is thicker. NEVER RUST:The decking screws are zinc plated and yellow passivated to withstand 72 hours salt spray test, never rust is guaranteed. HIGH HARDNESS:These self tapping screws are heat treatment improves the tensile strength. HIGH STRENGTH:The outdoor screws have high Strength philips head,Perfect match with manual and electric screwdrivers. VARIOUS PRODUCT USESHigh performace for the home and engineering,These flat head screws can used for woodplasterboardchipboardconcretewalldeckplastic. Product description When the quantity and model are the same,the weight of our wood screws is maximum. The screw head is hard to destroy even while being drilled violently with electrical screwdriver. Strongest & Never Rust BRAND CONCEPT: Provide The Most Reliable Product The letters on the screw head of different batches is slightly different. SPECIFICATIONS: Material: high-carbon steel Size: M4*30mm Color: yellow PACKAGE INCLUDING 100*wood screws