MULTIPURPOSE - 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. WHAT YOU GET - The package comes with 20pcs standoff screws that measure M3 thread, 4mm+3mm female-male length. RELIABLE MATERIAL - The standoff screws are made of brass material, have advantages over the plastic standoff screws, do not rust, durable, stable and reusable. SPECIAL DESIGNED - Specially designed to keep PCB at a consistent height and prevent it from bending, twisting, and short-circuiting. KINDLY NOTE - Please measure the length you need for your project, then choose the appropriate standoff screws to save you time and effort.