Cup washers are indented washers used with either round or countersunk head screws. These washers are designed to create a flush finish, often seen on furniture.
Zinc-plated cup washers (or finishing washers) are concave, hardened steel fasteners designed to hold screws flush, providing a tidy, finished look while spreading load forces to prevent damage to materials.
They offer high corrosion resistance, making them ideal for wood, metal, or plastic projects. They are often used in automotive and construction.
4 gauge diameter = 2.9mm
