M3 M4 M5 M6 Screw, Bolt and Nut Set, 500 Pieces Black Hex Socket Head Cap Screws Flat Head Bolts, Threading Machine Bolt and Nut Assortment Tool Set

[Black Nuts and Bolts]: Screw set: 10 pieces for M3x10mm/20mm/25mm/30mm, 40 pieces for nuts, 45 pieces for washers; 10 pieces for M4x10mm/20mm/25mm/30mm, 40 pieces for nuts, 45 pieces for washers; 10 pieces for M5x10mm/20mm/25mm/30mm, 40 pieces for nuts, 45 pieces for washers; 10 pieces for M6x10mm/20mm/30mm/40mm, 40 pieces for nuts, 45 pieces for washers. Total number: 500 pieces.
[Bolt Material]: The M3 M4 M5 M6 socket head cap screw kit with hex socket screws and nuts is made of 10.9 grade carbon steel. Much harder than stainless steel. Not suitable for use in humid environments.
[Easy to Use] Nuts and washers can expand the contact area, reduce pressure, and protect screws and parts. The threads of the black carbon steel socket head cap screws are uniform, smooth, and strong, difficult to deform or slip during operation, and fit the screw perfectly. Each set of screws also comes with a reusable storage box.
[The Perfect Tool] All nut and cap bolt washers are packaged in a durable and sturdy plastic box to prevent screws from being scattered or lost during use. The screws are secured with a 4-piece wrench, also known as an Allen wrench. Supplied in a way that perfectly fits our M3, M4, M5, and M6 screws.
[Wide Range of Applications] Hex socket head cap screws are suitable for door handles, lamps, knobs, and various mechanical accessories for minor repairs in shops, garages, or homes; as well as various precision machines, sorting instruments, electronic products, household appliances, 3D printer components, industrial machinery, automotive, construction, smart home appliances, etc.