Abstract: A tool holder assembly, having a central tool holding shaft (1) provided, on the one hand, with a mounting cone for securement in a machine tool spindle and, on the other hand, on the side opposite the cone, with an intermediate cylindrical body provided at its forward portion with securement structure for a tool. It is provided also with a feeler device (2) centered on the central shaft (1) and guided in translation on this latter, with lubricating structure and with cleaning structure for the machining region at the location of application of the feeler device (2).

Abstract: A clip for pinning an assembly of sheet metal plates or the like together including a bearing face adapted to come into contact with the outer face of one of said outer plates of said assembly of sheet metal plates; at least one elongated element, adapted to pass through holes in register made in the plates of said assembly of sheet metal plates and provided with a hooking beak; and a mechanism for creating a relative displacement, of longitudinal direction, between said elongated element and said bearing face and possibly a transverse displacement of said hooking beak, so that said plates may be pressed between said bearing face and said hooking beak. The clip comprises a protecting tube made of a deformable material and surrounding said elongated element, including said hooking beak.