A relatively modern practical manual for metalwork, mainly instrumental. Locksmithing is a craft consisting in the ability to process metal in a cold state using manual locksmith tools (hammer, chisel, file, hacksaw, etc.). The purpose of locksmithing is manual production of various parts, repair and installation work. A locksmith is an employee who performs cold metal processing, assembly, installation, dismantling and repair of all kinds of equipment, machines, mechanisms and devices using manual locksmith tools, simple auxiliary means and equipment (electrical and pneumatic tools, simple machines for cutting, drilling, welding, bending, pressing, etc.).