★ Please confirm the length and size information before purchasing. Thank you for your understanding. ★ ★ Main Features ★ Zinc-Plated Carbon Steel has high strength and hardness ratings and resists corrosion in mild environments. Self-tapping screws provide secure fastening with strong holding power without the need to pre-drill. Widely used in hardware, digital, doors and windows, furniture, office, etc. ★ Material and color ★ Carbon steel screws(black self tapping screws) ★ Package include ★ (Diameter*length*quantity) 1Organizer Box(black screw 420Pieces) (KA)Countersunk screw (black tapping screw 210 pcs) Length M3*12 quantity:60pcs Length M3*16 quantity:50pcs Length M3*20 quantity:40pcs Length M3*25 quantity:30pcs Length M3*30 quantity:30pcs (PA) Round head screws (black tapping screw 210 pcs) Length M3*12 quantity:60pcs Length M3*16 quantity:50pcs Length M3*20 quantity:40pcs