Upgrade your fastening toolkit with our comprehensive 380-piece #8-M4.2 self-drilling screw set. Engineered from premium 410 stainless steel, these screws are heat-treated to HRC 40+ hardness, delivering unmatched durability for metalworking, wood projects, and construction. Each screw features a Phillips washer head for secure, damage-free installation. The sharp, self-drilling tip eliminates the need for pilot holes, saving time on jobsites. The 8 versatile lengths (13mm-50mm) tackle everything from thin metal sheeting to thick wooden beams. Perfect for professionals and DIY enthusiasts, this set includes labeled compartments in a rugged storage case for easy access. Whether you're assembling furniture, installing roofing, or repairing machinery, these screws provide reliable performance at an unbeatable value.