140Pcs M3 Brass Standoffs Screws Washers Nut Assortment Hex Set Hardware Accessories Item Type: M3 Brass Standoffs Screws Washers NutMaterial: Brass. Uses: Hex pillar, also known as hex standoff, hex spacer column, hex support column, hex column, etc., plays a supporting and connecting role, and is widely used in the assembly of various circuit boards and electronic fields of computer connectors. Mainly used in industries such as computers and circuit boards. When one end is screwed into the locked object, the hex column is exposed to the outside, which can fix or isolate other objects. The male and female screws are assembled on the computer host. The external thread connects to the main board inside the host. The internal thread isolates the main board from the sheet metal housing. The terminal wires to be connected are connected from the sheet metal housing to the internal threads of the male and female copper columns with a screw. Products Include:Double-Pass Hex Stud:10 X M3 X 5+610 X M3 X 10+610 X M3 X15+610 X M3 X 20+6Single Head Hex Stud:10 X M3 X 5mm10 X M3 X 10mm10 X M3 X 15mm10 Xm3 X 20mmScrew: 20 X M3Nut: 20 X M320 X Spacer