Thread Size: 1/4 inch; Thread Pitch: 20 TPI; Thread Length: 2.5 inch Head Diameter: 0.413 inch; Hex Drive: 5/32 inch (4 mm); Please refer to the Picture 2 to get more details about the specifications Feature: The screws are precision threaded fasteners with an internal socket drive for installing in areas with limited side clearance; The internal hex drive requires a hex wrench which is included in the package for your convenience; Easy assembly and disassembly; Ease of cleaning; Beauty of appearance Made of 18-8 (304) stainless steel, these screws feature a smooth black coating that enhances salt spray resistance for use in harsh conditions, while providing a clean, burr-free matte-black finish Application: It's used for a wide variety of home and co mmercial applications; Ideal for most furnitures like Beds, Tables, Cabinets, Shelves, Chairs, Closets, Stands, 3D printers and more