An assortment of stainless steel serrated whiz nuts from Hillman. Whiz lock nuts, also known as serrated flange lock nuts, are ideal for applications in which a vibration or torque-resistant fastener is desired. Serrated whiz nuts come with a grooved underside that provides a reliable hold. This assortment features USS and SAE screw thread variants running #10-24 thru 1/2"-13 in size. Full assortments of #46098 contain nine (9) refills comprised of Hillman item numbers #46099 and #409087 - #409094.