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Dimension: M2, M2.5 series screws are often used to fixing keyboard, case, internal parts, M3 series screws are usually used to fixing laptop hard disk. Material: High quality carbon steel, black zinc plated, high hardness, good appearance, environment protection, anti-rust, anti-corrosion, sturdy and durable. Technology: Standard depth and dimension of screw cross slot, flat and smooth screw section without residual burrs, clear and tidy thread without gap.
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Dimension: #6-32, this is the standard one used on computer cases, PSU mountings, HD mountings, etc. Material: Textured plastic head, nickle plated carbon steel screw, durable, lightweight, and useful. Usage: Philips cross slot, textured plastic head designed for easy grip, provide quick installation for securing cases. Tighten by hand, then secure snugly with a screwdriver.