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Serrated Flange Nuts with a Bright Zinc Plated finish.
These look like a standard hex nut from one side, with the other being widened into a circular flange with a serrated surface.
This allows for a better grip and offers a greater resistance to vibration.
Also known as face nuts, spin locks or serrated tooth nuts, please note that when these nuts are tightened the mating surface will be scored by the serrated flange.