Material: A2-70 304 stainless steel. High quality M3 M4 M5 screws and nuts, comply with EU ROHS & WEEE environmental directives. Package Quantity: 500pcs (+/- 2%) = 250pcs Flat Head Bolts and 250pcs Nuts. All screws and nuts are packed in clear plastic box, can be used for storage box fastening component, industrial and construction fasteners. Widely used for door handles, faucet, light fixture, knobs, gun repair, plumber and other small repairs around the shop, garage or home.