The 50mm stroke key is made of chromium-vanadium material for hardness and longevity in use. Wide use in light industry, heavy industry, trucks and trucks etc. Finishing is excellent for high resistance to corrosion. The key is easy to clean and easy to read, this key is a product that provides a 1/6-fold increase in the step, or it also serves to release or keep the boluses that cane not be released.