Each stud is precisely heat-treated to 190,000 psi. Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure results in an exceptionally straight part. Machining the part after heat treating it is difficult and costly because the alloy steel is much harder, but provides a very consistent and reliable part. We have a large and rapidly expanding range of items for the Supra- consumeables, performance upgrades, tuning items. Please check out the other items in our shop for brakes, water pumps, spark plugs, filters, fuel pumps, and lots of other essential parts. Our the store store also contains a wide range of suspension and steering parts- Wheels, wheel bearings, strut bars, anti roll bars, camber arms, & performance Superpro up.