Standoffs are used to mount circuit boards and other parts inside of enclosures or on mounting plates. These are designed to space the board away from anything that may cause it to short, or allow stacking of several boards. This particular standoff is made of nylon (so it is non-conductive) and has a female 4/40 thread on one end and a male 4/40 thread on the other. The “between board” height of this standoff is 3/8″.