Specifications:Standoffs:Material: BrassType: Male-FemaleSize: M2.5*5+6, M2.5*6+6, M2.5*7+6, M2.5*8+6, M2.5*9+6, M2.5*10+6, M2.5*11+6, M2.5*12+6, M2.5*15+6mmQuantity: 20pcs each sizeNuts:Material: Stainless steelThread: M2.5Quantity: 180pcsBox Size: 13 x 6.5 x 3cm / 5.11 x 2.55 x 1.18" 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 nine different available lengths that you can use as need for different purposes. Great standoffs to mount on circuit boards or machine to create space or to properly position them. Widely used in machinery industry, electronic industry, testing equipment, electric equipment, medical equipment, communications, automotive, engineering machinery, electric power and other fields.