✔ Includes 500 Pcs, 13 Sizes, M3 Hex Socket Head Cap Screws, Screws Head Style: Socket Cap Head, Screws Drive Style: Hex Socket Drive ( Hex Size 2.5 mm ), Thread Pitch 0.5 mm, Thread Size ( Diameter ) 3 mm, Thread Length From 4 mm to 50 mm: M3 x 4, M3 x 6, M3 x 8, M3 x10, M3 x 12, M3 x 16, M3 x 20, M3 x 25, M3 x 30, M3 x 35, M3 x 40, M3 x 45, M3 x 50. These Screws are Made of Made of Stainless Steel 304 and Not Need Additional Finish,High Strength and Anti-corrosion in Various Conditions. | ✔ Includes 500 Pcs Thread Pitch 0.5 mm M3 Hex Nuts to Meet Different Applications;These Hex Nuts are Made of Made of Stainless Steel 304 and Not Need Additional Finish,High Strength and Anti-corrosion in Various Conditions. | ✔ Includes 500 Pcs Φ3 Washers: Add More Touch Area to Meet Different Applications, Protect Parts from Being Damaged;These Washers are Made of Made of Stainless Steel 304 and Not Need Additional Finish,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; This Hex Key is Made of Chrome-Vanadium Steel and Nickel Plated, Higher Strength and Anti-rust | 【 Organized and Packed Well 】 These 500 Pcs Screws, 500 Pcs Hex Nuts, 500 Pcs Washers and 1 Pcs Hex Key Packed in a Sturdy Multi-compartments Plastic Organizer Box , Organized Conveniently and Easily【 About Hex Socket Drive 】 Hex Socket Drive, also known as Internal Hex Drive, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen Wrench 【 AboutSocket 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