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 1-800-388-4825 or visit www.afshuck.net/us/en/Products... for more information.