displacement of about 2 mm during rotation of the clamp strap 1 around the supporting rod 2 the cutting edges 10 and 11 cut threads in the stock of the supporting rod 2 the clamp strap 1 is thus held particularly tightly on the supporting rod while the clamp ears 4 and 5 bite firmly into the stock of the supporting rod 2 in the threads cut on either side thus producing a very tightly locked connection the flat part 8 of the clamp strap 1 forms a whole with a flat connecting element 9 that extends downward and is provided with two flexible narrow teeth or legs 14 and 15 which are twisted out of the plane of the flat part of the connecting element specifically at an angle of about 20 u00b0 that is to say that each of the legs 14 and 15 is twisted about its own longitudinal axis the direction of the twist with respect to the plane of the element 9 is the same for both legs i e counterclockwise when viewed from below in fig1 3 the amount of twist is such as to produce an angle of about 20 u00b0 between the plane of the connecting element 9 and the plane of leg 14 as well as between the plane of the connecting element 9 and the plane of the leg 15 the planes of the.