20x M6 A2 Stainless Steel Blind Hex Nuts DIN 917 Low Profile Nuts. These nuts are also known as low-profile or DIN 917 hex nuts, featuring a low profile and no internal hole. They are used to secure threaded rod ends or other components against accidental loosening. Their low profile allows for a neat and discreet finish to the rod. Commonly used in constructions, furniture, and various industrial applications requiring secure thread endings.