| All 25CD's now on two data DVD's for use on your computer. Most files are Adobe PDF, so you can store these on your computer or laptop, or print out individual articles. Over 1000 different articles on old locks, safes, new locks, strange locks, plus reprints of all sorts of manuals. 1930's lock manuals, key machine manuals, and so much more. This is a must have reference for the locksmith.