Material: Brass; Thread: M2 M2.5 M3 M4 M5; Packing List: 10pcs M2x5mm+3mm Standoffs, 10pcs M2.5x5mm+6mm Standoffs, 10pcs M3x5mm+6mm Standoffs, 10pcs M4x5mm+6mm Standoffs, 10pcs M5x10mm+7mm Standoffs Our standoff screws are widely used in computers, computer cases, circuit board assembly and other electronic fields. The PCB standoffs play a supporting, isolating and fastening role in the use. The standoff screws are made of brass, which is rust-free, durable, stable, and reusable compared with plastic. Specially designed to keep PCB at a consistent height and prevent it from bending, twisting, and short-circuiting. NOTE: Please measure the required length of your project, and then select the appropriate standoffs to save your time and effort.