The hex nut is a six-sided nut that fastens screws and bolts efficiently and securely. They are the most common hexagonal fastener that has internal threads that screw onto the shank of a bolt or a hex cap screw. The Brass Hex Threaded Pillar Standoff Spacer Range from sharvielectronics.com are versatile standoffs designed to securely mount your PCB as well as elevating it from other components such as the inside of a computer chassis, Quadcopter frames, Motor Driver Body or any other PCBs that come in your DIY Projects