Product Review

  Meets/exceeds:  ISO 7380
  Head style: Button head
  Drive style: Hex socket drives, known as internal hex drives
  Head Diameter:  9.27mm/ 0.36"
  Head Height:  2.6mm/0.10"

  Thread Diameter: 5mm/0.197"
  Thread Pitch:  0.8 mm
  Thread Length:  10mm/0.39"
  Total Length:  12.6mm/0.50"

  Material:  Alloy steel, 10.9 grade, hardness: HRC 32-39
  Rust proof:  Black oxide finish, covered with anti-rust oil

  Package:  100 Pcs screws, packed in an sturdy sotrage case

About Hex Socket Drives:
 Hex Socket drives, also known as internal hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench
About Button Head:
 Button head is similar to standard pan head but havs a curved top