The naked eye can see the quality differences between this randomly selected torque-to-yield (TTY) bolt (silver) and the high-end (black) ARP head bolts. Both are designed to do their job but require proper installation in clean threads with lubrication. TTY bolts cannot be reused, while high-end head bolts can be reused. The difference is in the materials, with aftermarket bolts using much higher-quality materials and design. TTY bolts use cheaper materials but are designed to work despite this and are thus more cost effective for mass production.