1These standoffs are made of high quality brass material for durability and long service life 2Waterproof standoffs with good thermal conductivity are rust resistant and easy to clean, you can simply clean them with a cloth 3There are seven different available lengths that you can choose as you need for different purposes 4Great standoffs to mount on circuit boards or machine to create space or to properly position them 5Widely used in machinery industry, electronic industry, testing equipment, electric equipment, medical equipment, communications, automotive, engineering machinery, electric power and other fields Description: A standoff is a fastener that is used to create space between two objects, often to properly position them. In the world of electronic components and electronic hardware, standoffs are typically used to space circuit boards, panels, doors or gears. These standoffs are made of brass for good thermal conductivity, electrical conductivity and rust resistance. Features: These standoffs are made of high quality brass material for durability and long service life. Waterproof standoffs with good thermal conductivity are rust resistant and easy to clean, you can simply clean them with a cloth. There are seven different available lengths that you can choose as you need for different purposes. Great standoffs to mount on circuit boards or machine to create space or toproperly position them. Widely used in machinery industry, electronic industry, testing equipment, electric equipment, medical equipment, communications, automotive, engineering machinery, electric power and other fields. Specifications: Material: Brass Type: Female-Female Size: M3*5, M3*6, M3*8, M3*10, M3*12, M3*15, M3*20(Optional) Quantity: 100pcs Package Includes: 100pcs x Standoffs