[High-quality material] Hexagon-head self-drilling screws are product of high-quality A-grade carbon metal for 14H, which has increasedpower and higher corrosion resistance and is appropriate for industrial utility. Present good power and corrosion resistance in harsh surroundings. [Self-tapping] Tremendousstainless-steel self-tapping is to design a drill tip on the tip, which maysimply penetrate metal plate, iron sheet, aluminum sheet and so forth. Hexagon washer head is harassed evenly and won't [Widely used] Self-tapping screws are perfect forwooden. Steel or differentrobustsupplies are well-knownfor his or herenvironment friendlyutilityefficiencyand sturdiness. They'rebroadlyutilized innumerous industries, reminiscent ofbuilding, manufacturing, engineering, meetingand so forth. "Dimension": # 5.5; The screw size is 50cm. "Together with packaging": 25 items.