1Suitable for electronic products, chemicals, machinery and equipment, furniture, etc. 2Stainless steel 304 set screw, not easy to rust, anti-corrosion. 3M3, M4, M5, M6, M8 multiple models, multiple sizes to meet different needs. 4Precision threads can easily go through various materials. 5Well packed and assorted in a resealable transparent box for convenient storage and carry.