High Quality 304 Stainless Steel provides strength and offers good corrosion resistance in many environments. Durable stainless steel material which serves for a long using time. Different Size of M3: M3 Nuts(220pcs), M36 Bolts(20pcs),M38 Bolts(20pcs), M310 Bolts(20pcs), M312 Bolts(20pcs), M316 Bolts(20pcs), M318 Bolts(20pcs), M320 Bolts(20pcs), M325 Bolts(20pcs), M330 Bolts(20pcs), M335 Bolts(20pcs), M3*40 Bolts(20pcs). Screws and nuts are packed in a sturdy plastic box, this set is organized in a transparent storage case for quick access and protection. Wide Application: Widely used to fasten sheet metal to wood, fiberglass or metal, widely used in the home and office appliance, communication equipment, ship assembly and others. Package include: 440 x Head Screw Bolts Nuts, 1 x Plastic box, 2 x Wrenchs.