Made of stainless steel material, good resistance, to use. Equipped with a plastic box, you can classify screws in an organized manner, more convenient to carry and take out. This M3 screws have different length, which can meet different needs. 500pcs M3 screws are enough for using. Used widely in the home and office appliance, furniture and other machinery industry. Model: Self-Tapping Screws Thread size: M3 Thread tolerance: 5g Application: Electronics industry fasteners Colour: silver Material: stainless steel Package Contents: 100 * M3*6 Button Screws 100 * M3*8 Button Screws 100 * M3*10 Button Screws 100 * M3*12 Button Screws 40 * M3*16 Button Screws 30 * M3*18 Button Screws 30 * M3*20 Button Screws 1 * Plastic box (Random style, don' accept the specified style) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.