Specifications:Made of high quality 304 stainless steel, it can offer good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas.There are many types of bolts, nuts and washers in this set to meet your different needs.The nuts and flat washers expand the contact area and reduce the pressure in order to protect the screws and parts.Item Name: Bolts Nuts SetMaterial: Stainless SteelProduct Model: M3Product Head Type: Hex Cylindrical HeadQuantity: 280Pcs, 380PcsFeatures: Multiple Models, Durable, Anti-rust, Wear-resistantBox Size:280Pcs: 13cm x 6.5cm x 2.3cm/5.12" x 2.56" x 0.91" (Approx.)380Pcs: 17.6cm x 10.2cm x 2.3cm/6.93" x 4.02" x 0.91" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.280Pcs Package Includes:20 x 4mm Bolts20 x 5mm Bolts20 x 6mm Bolts20 x 8mm Bolts20 x 10mm Bolts20 x 12mm Bolts20 x 16mm Bolts20 x 20mm Bolts20 x 25mm Bolts100 x Hexagon Nut380Pcs Package Includes:20 x 5mm Bolts20 x 6mm Bolts20 x 8mm Bolts20 x 10mm Bolts15 x 12mm Bolts15 x 14mm Bolts15 x 16mm Bolts15 x 18mm Bolts10 x 20mm Bolts10 x 25mm Bolts10 x 35mm Bolts10 x 40mm Bolts100 x M3 Nuts100 x M3 Flat Washer