【 5 Sizes M5 Hex Socket Button Head Cap Screws Assortment and 1 Pcs Hex Key 】
✔ Meets/Exceeds: ISO7380
✔ Screw head style: button head, head diameter: 9.3 mm, head height: 2.6 mm
✔ Screw drive system: internal hex drives, also known as hex socket drives, hex size: 3.0 mm
✔ Thread Size ( Diameter ): 5 mm, Thread pitch: 0.8 mm, Thread Length from 8 mm to 20 mm
✔ Material of screws: stainless steel 304, high strength and anti-corrosion in various conditions
✔ Includes 1 Pcs hex key, hex size: 3.0 mm, to drive these screws conveniently and easily
✔ Material of hex key: chrome-vanadium steel, nickel plated, higher strength and anti-rust
✔ Easy to store: all these screws and 1 pcs hex Key packed in a sturdy easy-use plastic storage case, organized conveniently and easily

[ M5 x 8 means : metric screws, thread size ( Diameter ): 5.0 mm, thread length 8 mm ]
[ Sizes ]-----[ Thread Length ]-----[ Total Length (Include Head)]
M5 x 8 ------ 8 mm/0.31"------- 10.6 mm/0.42"
M5 x 10 ------ 10 mm/0.39"------- 12.6 mm/0.50"
M5 x 12 ------ 12 mm/0.47"------- 14.6 mm/0.57"
M5 x 16 ------ 16 mm/0.63"------- 18.6 mm/0.73"
M5 x 20 ------ 20 mm/0.79"------- 22.6 mm/0.89"

[ Package Contains ]
M5 x 8------20 Pcs
M5 x 10------20 Pcs
M5 x 12------20 Pcs
M5 x 16------20 Pcs
M5 x 20------20 Pcs
Hex Key ---1Pcs

[ About Internal Hex drives ]
Internal Hex drives, also known as Hex Socket Drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen Wrench
[ About 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