Superior quality. Made from high quality stainless steel. The heavy-duty screw set represents good corrosion resistance in harsh environments such as high temperature, cold weather and high humidity areas. Standard Metric. Our M3 M4 M5 M6 screws and nuts agree with the standardized metric system and the average error is less than 0.01mm, It features good workability and installations are more precise. Comes with nuts and washers. Nuts and flat washers help to expand the contact space and reduce pressure to protect screws and parts, maximally meet the varied needs of professionals. Long-term and convenient storage . The screws, nuts and washers are arranged in a durable and sturdy box, the box is divided into multiple tiles to store all types respectively, which allows you to easily find your way through the series and avoid loss.< /p> Wide application. The main use of stainless steel hex screw is very common in electronics, electrical appliances, chemicals, water, machinery and equipment, furniture and many other fields. Specification Material: 304 stainless steel Color: silver Type: round head screw, hexagon head nut Package includes 10pcs x M3*8mm screws 10pcs x M3*12mm screws 10pcs x M3*16mm screws 10pcs x M3 * 20mm screw 45pcs x M3 nut 45pcs x M3 washer 10pcs x M4 * 8mm screw p> 10pcs x M4 * 12mm screw 10pcs x M4 * 16mm screw 10pcs x M4 * 20mm screw 45pcs x M4 nut p> 45pcs x M4 washer 10pcs x M5 * 8mm screws 10pcs x M5 * 12mm screws 10pcs x M5 * 16mm screw 10pcs x M5 * 20mm screw 45pcs x M5 nut 45pcs x M5 washer 10pcs x M6 * 8mm screws 10pcs x M6 * 12mm screws 10pcs x M6 * 16mm screws 10pcs x M6 * 20mm screws< /p> 45pcs x M6 nut 45pcs x M6 washer