Prime-Line9118766K-LockNutsWithExternalToothWasher#6-32ZincPlated St...Prime-Line 9118766 K-Lock Nuts With External Tooth Washer #6-32 Zinc Plated Steel (50 Pack) K-lock nuts feature a built in external tooth lock washer that is free spinning. The teeth on the lock washer can bite into the surface and help lock the nut...more