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✔ Includes 100 Pcs, 5 Sizes, M4 Hex Socket Flat Head Cap Screws: M4 x 8, M4 x 10, M4 x 12, M4 x 16, M4 x 20
✔ Includes 1 Pcs Hex Key, Hex Size: 2.5 mm, Can Drive These Screws Conveniently and Easily
✔ Material of Screws: Alloy Steel, Black Oxide Finish, High Strength And Anti-rust; Material of Hex Key: Chrome-Vanadium Steel, Nickel Plated, Higher Strength And Anti-rust
✔ Strength Grade of Screws: 10.9 Grade, Hardness: HRC 32-39, Tensile Strength: 1040 N/mm²
✔ Package: All These Screws and 1 Hex Key Packed In a Sturdy Easy-use Plastic Storage Case, Organized Conveniently and Easily
✔ Meets/exceeds: DIN7991 ✔ Screw Head Style: Flat head, known as countersunk head, countersunk angle: 90 Degree ✔ Screw Drive Style: Internal Hex Drives, known as Hex Socket Drives, hex Size: 2.5 mm ✔ Head Diameter: 7.8 mm/0.31", Thread Size(Dia.): 4 mm; Thread Pitch : 0.7 mm ✔ Rust proof of Screws: black oxide finish covered with anti-rust oil [ Sizes ]---[ Thread Length ]---[ Total Length ] M4 x 8---------5.7mm---------8mm M4 x 10--------7.7mm---------10mm M4 x 12--------9.7mm---------12mm M4 x 16--------13.7mm--------16mm M4 x 20--------17.7mm--------20mm [ Package Contains ] M4 x 8--------20 Pcs M4 x 10--------20 Pcs M4 x 12--------20 Pcs M4 x 16--------20 Pcs M4 x 20--------20 Pcs Hex Key ------1 Pcs [ 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 Flat Head ] Flat head screws are designed to fit flush to the surface when used with countersunk holes