The Huck BobTail® Fastening System has been designed to deliver the highest level of performance and reliability in an advanced HuckBolt® design. It offers 5 to 10 times the fatigue strength of conventional nuts and bolts, mostly due to its shallow thread and large root radius. No gap. Fast and easy to install. Call 18003884825 or visit http://www.afshuck.net/us/en/Products... for more information.