: Material: Made of 304 stainless steel with good rust resistance. Size: M5x0.8mm Advantages: Used where frequent adjustment or removal of fastener connections is required. Installation of the product does not require any tools, just turn the hand can be completed. Applications: Mechanical equipment, electronic equipment, communication equipment, hardware lighting, building bridges, furniture decoration, etc. Package includes:20pcs M5 wing nuts,stainless steel 304 fastener parts