Product Description Whiz-Lock, one-piece, all-metal, free-spinning nuts have been proven to overcome vibration and a variety of other forces. The underside, or bearing surface of the fastener, has a series of spiraling serrations, or teeth, to provide a locking, reliable hold. The application of this nut is as simple as spinning it on. From the Manufacturer Whiz-Lock, one-piece, all-metal, free-spinning nuts have been proven to overcome vibration and a variety of other forces. The underside, or bearing surface of the fastener, has a series of spiraling serrations, or teeth, to provide a locking, reliable hold. The application of this nut is as simple as spinning it on.