Screw Size: M2.5 x 9mm / M2 x 0.35"(D*L); Thread Length: 2.6mm / 0.1"; Pitch: 0.45mm; Head Size: 5 x 1mm / 0.2" x 0.04"(D*T); Spring Outer Max Diameter: 7mm / 0.28"; Package Content: 10pcs x PC Spring Screws Material: The spring screw is made of carbon steel, with a nickel-plated finish, anti-rust and corrosion resistance, and high hardness. Features: The design of the spring is mainly to prevent the fixing screws from being too tight, so that the heat sink base and the contact surface of the chip have a buffer, so as to avoid crushing the graphics card core. Installation: You only need to install it with a cross-head screwdriver. When installing, usually screw it until it can’t be screwed, do not be too tight. It is better to use it with an insulating washer(the package does not include washers). Application: The PC spring screws are used to fix the back plate of the GPU graphics card radiator.