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✔ Includes 50 Pcs, 5 Sizes, M3 Hex Socket Head Cap Screws: M3 x 40, M3 x 45, M3 x 50, M3 x 55, M3 x 60; Thread Length from 40 mm to 60 mm, Thread Size ( Diameter ): 3 mm, Thread pitch: 0.5 mm
✔ Material of Screws: Stainless Steel 304, High Strength And Anti-corrosion in Various Conditions
✔ Includes 1 Pcs Hex Key, Hex Size: 2.5 mm, to Drive These Screws Conveniently and Easily
✔ Material of Hex Key: Chrome-Vanadium Steel, Nickel Plated, Higher Strength And Anti-rust
✔ Package: All These Screws and Hex Key Packed In a Sturdy Easy-use Plastic Storage Case, Organized Conveniently and Easily
✔ Meets/Exceeds: DIN 912 ✔ Screw head style: socket cap, head diameter: 5.5 mm, head height: 3 mm ✔ Screw drive system: internal hex drives, also known as hex socket , hex size: 2.5 mm ✔ M3 x 40 means : Metric screws, Thread diameter size 3 mm, Thread length 40 mm [ Sizes ]-----[ Thread Length ]------[ Total Length ] M3 x 40----------40mm/1.57"---------43mm/1.69" M3 x 45----------45mm/1.77"---------48mm/1.89" M3 x 50----------50mm/1.97"---------53mm/2.09" M3 x 55----------55mm/2.17"---------58mm/2.28" M3 x 60----------60mm/2.36"---------63mm/2.48" [ Package Contains ] M3 x 40------------10 Pcs M3 x 45------------10 Pcs M3 x 50------------10 Pcs M3 x 55------------10 Pcs M3 x 60------------10 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 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