sentences:  Sometimes threaded or snap-lock plastic standoffs are used, which are less secure, but equally useful in a stationary computer.The standoff provides a margin of space between the motherboard and the case to keep the multiple solder points below from grounding and short-circuiting.Usually, the standoff has a #6-32 UNC male thread on one end which screws into a threaded hole in the case or motherboard backplate and a #6-32 UNC female thread in the other end which accepts a screw to retain the motherboard.