POPULAR PLUG STYLES MOST COMMON

Have you wonder why there is many different plugs on the market and wondering what they are for, here is an example of Lever, Ballknob and Deadbolt plugs mainly used in Commercial applications for the following brands, DOREX, LSDA, BLUESCORPION AND DIFFFRENT IMPORT COMPAGNIES, 

in the pictures we have noted what plugs to belong to which lock suppliers.