Brand: Automotive Racing Products (ARP)
These high-strength ARP bolts are great for installing most accessories.  The 170,000 psi tensile strength bolts are made of stainless steel with a polished, corrosion-resistant finish.  Pack of 5 bolts includes matching washers.  
These bolts have 7/16-14 UNC threads and a 4" under-head length, including the 2 3/4" long grip (unthreaded portion).  The hex head takes a small 7/16" wrench, but has a 0.67" diameter bearing surface*.  Head measures 0.40" high. 
* Standard AN960-716 flat washers have a 0.75" OD.