Dab nails refer to the accessory of a dab rig (or dab bong) that is used for vaporizing cannabis concentrates like wax, resin, shatter, and more. Dab nails are one of the most essential parts of dabbing, dabbers normally use a butane torch to heat the quartz banger or the titanium nail to a certain level of temperature (300~500 degrees Fahrenheit for low-temperature dabs and 700+ for high-temperature dabs) and place their cannabis concentrate of choice onto the nail/banger to vaporize the concentrate and inhale the vapor through a water pipe/bong/dab rig. It's considered to be one of the most healthy ways to consume their medication.