1、200pcs One Pack: There is 200pcs self drilling screws in total, which is enough quantity for usage, one pack can be used for long time 2、Small Deformation: The thread is clean, accurate, compact and powerful, the screw is not easy to deform and slip 3、Clear and Neat Thread: The screw section is smoothly without burrs, the thread is clear and neat without gaps, which is conducive to tightening 4、410 Stainless Steel Material: These drill screws are made of 410 stainless steel, which is rust proof and corrosion resistance, sturdy and durable 5、Widely Application: These screws are widely used in household and office appliances, fasteners in the workplace, electrical products, communication equipment, ship assembly, machinery, furniture, repair work, DIY crafts, etc.