• Package quantity: 230 Pieces, packed in a transparent and durable plastic box with compartments for easy access. • Sizes and quantities: M3.5*16 (20 Pieces), M3.5*20 (30 Pieces), M3.5*25 (30 Pieces), M3.5*30 (50 Pieces), M3.5*35 (30 Pieces), M3.5*40 (30 Pieces), M3.5*50 (40 Pieces). • Made of stainless steel with black oxide coating, offering excellent anti-rust performance and corrosion resistance even in humid environments. • Thick and precise threads, with high-precision cutting technology, to easily penetrate wood, plastic, and drywall. • Suitable for indoor and outdoor use, ideal for installing metal, plastic, or board items at home, office, or workplace. • Widely used in electrical products, communication equipment, ship assembly, machinery, furniture, maintenance work, crafts, and DIY.