An assortment of metric whiz and keps nuts from Hillman. Keps nuts are nuts with an attached, free spinning washer for simplified installation. Whiz lock nuts, also known as serrated flange lock nuts, are ideal for applications in which a vibration or torque-resistant fastener is desired. Variants included in this assortment range 0.7 thru 1.75 in pitch and M4 thru M12 in diameter. Full assortments of #45554 contain eleven (11) refills comprised of Hillman item numbers #45555 - #45565.