iExcell 80 Pcs M5 x 8mm/12mm/16mm/20mm 12.9 Grade Alloy Steel Hex Socket Head Cap Screws Bolts Assortment, Black Oxide Finish;

✔  Meets/Exceeds: DIN 912
✔  Screw head style: socket cap, screw drive style: hex socket, known as internal hex drives
✔  Rust proof: black oxide finish with anti-rust oil
✔  Easy to store: these screws come in an easy-use storage case

Item-------------Thread Length---------Total Length
M5 x 8mm------------8mm--------------13mm
M5 x 12mm-----------12mm-------------17mm
M5 x 16mm-----------16mm-------------21mm
M5 x 20mm-----------20mm-------------25mm
M5 x 25mm-----------25mm-------------30mm
Package Contains:
M5 x 8mm---------10 Pcs
M5 x 12mm--------10 Pcs
M5 x 16mm--------10 Pcs
M5 x 20mm--------10 Pcs
M5 x 25mm--------10 Pcs
Total: 50 Pcs

Hex Socket Drives:
  Hex socket hex 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
Socket Cap Head:
  Socket Cap Head ,also known as Allen head ,have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key