As correctly pointed out by ASimpson, there are classification of fits which are application specific. He lists the metric version, imperial are equivalents noting 1.0 inch = 25.4 mm. There are several good references on this, look to the web. But the Machinist Handbook does discuss this, at least in the 23rd edition.
How does Dhea work? DHEA is a parent hormone produced by the adrenal glands near the kidneys and in the liver. In men, DHEA is also secreted by the testes. It is changed in the body to a hormone called androstenedione. Androstenedione is then changed into the major male and female hormones.
Ingredient Detail Description: DHEA-DHEA is a hormone produced by the adrenal glands and is used by the body as the staring material for testosterone and estrogen. The body makes its own DHEA, however, by age 60 makes only 5-15% of what it did at age 20.For use as a supplement, DHEA is manufactured from substances found in soybeans.HEA-DHEA is a hormone produced by the adrenal glands and is used by the body as the staring material for testosterone and estrogen. The body makes its own DHEA, however, by age 60 makes only 5-15% of what it did at age 20. For use as a supplement, DHEA is manufactured from substances found in soybeans.