The main objective of this work was the problem of modular clamping devices in technical practice. It is divided into several parts. The first is basic distribution of jigs, their importance, properities and basic principles of jig design. The second and third part processes the basic types of support and clamping elements that occur in jigs. In the fourth part, an overwiew of the basic part sused in modular jigs is made. Most emphasis in fourth part is placed on clamping parts and their basic types.