Brand: Automotive Racing Products (ARP)
These high-strength metric ARP bolts are great for installing most accessories.  The 180,000 psi tensile strength bolts are made of 8740 chrome moly with a black oxide finish.  All bolts are packaged in sets of 5 bolts with matching washers.  
These M10 bolts (10 x 1.50mm thread) have a 50mm long under-head length, including the 24mm long grip (unthreaded portion).  The 12-point head takes a 12mm wrench, but has a full 18.5mm bearing surface.  The head measures 9mm tall.  
The ARP 300-Series 12-Point M10x1.50 Nuts (Part No. ARP300-8345, sold separately) are a perfect match for these bolts!