You're viewing an Aircraft close tolerance bolt used for special application such as landing gear or wing attach bolts or whatever high strength-tight fitting application you have.  These bolts sell for about $80.00 each depending on your supplier.  The grip length is 2&5/8" and 3.5" overall with gold cad-plating.  If you have any questions or desire more or different photos just let me know and I'll do my best to provide them.