Based on differences in head shape, small screws can be categorized into various types, including Phillips, slotted, hexagon socket, and Torx (star) drives. When classified by material, they cover options such as iron, stainless steel, copper, and aluminum alloy. Surface treatment methods include galvanizing, nickel plating, black oxide coating, and Dacromet coating, among others—all designed to a

What should you do when screws loosen?