Titanium Bolt with M6 or M5 metric thread suitable for stems, seat post clamps, and other bicycle parts. Tuning is a procedure to switch out heavier bolts with lighter bolts, which means replacing the stock OEM steel bolts with lighter titanium. The reason that bike manufacturers are installing a lot of heavy steel bolts on a bike is because they are cheap. Titanium weighs around 35-45% less then steel while aluminum is around 60-65% less. You can use Titanium anywhere you want to replace the steel bolts. When installing titanium you need to use anti-seize lubricant to prevent cold-welding. Titanium Bolt will not rust.