simple ramps 11 which are designed to guide the respective projections 15 along straight paths on their way toward and into the corresponding openings 13 the openings 13 are preferably disposed between the respective slits 12 this reduces the resistance of the innermost portions of the ramps 11 to bending because their connections with the main parts of the respective end portions 6 are relatively narrow the feature that the end portions 6 of the holder 1 are or can be straight at the time the corrugations 10 are formed therein renders it possible to use one and the same set of corrugating tools for the making of corrugations in holders which are intended to form components of clamps for large medium or small diameter pipes the resistance of the holder 1 to deformation can suffice to ensure that a pipe 8 which is forced into a position immediately adjacent the concave side of the intermediate portion 3 will be held in suspended position by resting on the corrugations 10 before the confining member 2 is attached to the end portions 6 and after the support 4 for the holder 1 is already secured to an overhead beam or the like as mentioned above the thus mounted holder 1 is thereupon continuously acted upon by the pipe 8 which rests on the corrugations 10 and urges the end portions 6 away from each other and into desirable pronounced engagement with.