Hex Drive Size: 7/16"; Width From Flat to Flat: approximately 0.4 inch; Overall Height: 0.298 inch to 0.328 inch;
High Quality Material: Made of Stainless Steel 304 (18-8) which provides good strength and corrosion resistance in bad environments without the need for time consuming and costly maintenance.
Will NOT COME LOOSE: With a nylon insert inside, the lock nuts greatly reduce loosening under vibrations and torque.