A device for holding and locking objects, for example workpieces, tools or the like, - with a support rack structured according to the type of a mesh structure created from wire strands aligned arranged on one plane (5, 6) each parallel to and at a distance from one another, by means of which at least one holding opening is created, - and with at least one connection body featuring a base, on one face end of which a holding socket is provided flush with a longitudinal axis, which can be inserted into one of the holding openings of the support rack and projects through it, and on the opposite face end of which there are attached one or more retaining or holding elements by means of which the objects can be fixed onto the connection body and the support rack, characterized in that, - the mesh structure is a square mesh structure and the holding opening, of which there is at least one, is a square holding opening the side edges of which have a mesh width, trans - that the holding socket has a square cross section and is adapted to the corresponding mesh width of the holding opening, - that the holding socket has at least two clamping grooves in the corresponding plane (5, 6) of the support rack, with these clamping grooves located diagonally opposite to one another in a mirror-symmetrical arrangement, with the clamping grooves located opposite to the two planes (5, 6) rotated through 90° about the longitudinal axis of the connection body and each of them extend along one of the longitudinal edges (31 and 33, 32 and 34) of the holding socket, - that the corresponding clamping groove has a curvature radius and a tangent such that the profile of the base of the clamping groove is formed in the planes (5, 6) of the support rack by the curvature radius and the tangent and - that the curvature radius transitions into the tangent within a quarter segment of a circle. - with a support rack structured according to the type of a mesh structure created from wire strands aligned arranged on one plane (5, 6) each parallel to and at a distance from one another, by means of which at least one holding opening is created, - and with at least one connection body featuring a base, on one face end of which a holding socket is provided flush with a longitudinal axis, which can be inserted into one of the holding openings of the support rack and projects through it, and on the opposite face end of which there are attached one or more retaining or holding elements by means of which the objects can be fixed onto the connection body and the support rack, characterized in that, - the mesh structure is a square mesh structure and the holding opening, of which there is at least one, is a square holding opening the side edges of which have a mesh width, trans - that the holding socket has a square cross section and is adapted to the corresponding mesh width of the holding opening, - that the holding socket has at least two clamping grooves in the corresponding plane (5, 6) of the support rack, with these clamping grooves located diagonally opposite to one another in a mirror-symmetrical arrangement, with the clamping grooves located opposite to the two planes (5, 6) rotated through 90° about the longitudinal axis of the connection body and each of them extend along one of the longitudinal edges (31 and 33, 32 and 34) of the holding socket, - that the corresponding clamping groove has a curvature radius and a tangent such that the profile of the base of the clamping groove is formed in the planes (5, 6) of the support rack by the curvature radius and the tangent and - that the curvature radius transitions into the tangent within a quarter segment of a circle.