Material: Brass; Thread: M5; Thread Pitch: 0.8mm; Female-Male Thread Length: 20mm+6mm; Packing List: 20 x Standoff Screws; 20 x Nuts 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. 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. NOTE: Please measure the required length of your project, and then select the appropriate standoffs to save your time and effort.