Locks and Locksmithing.
A downloadable twelve page booklet about all aspects of locks and locksmithing. The booklet covers the history of locks, an explaination of modern lock mechanisms, the future of locks and a section on lock picking.
The booklet comes as part of the Locksmith Collection.
Comination Lock,
Cylinder Lock,
Warded Lock and
Locksmith Booklet
£7.50 Only £4.99 including the free locksmith booklet!

You'll need adobe acrobat reader to view the file. It's free to download from here.