Abstract: A clamp for arrangement on a carrying arm is described. The clamp has a first and a second clamp half (10, 20) with in each case two lateral angle pieces (12; 21 ), in which are located a hole (14; 23) for positioning the clamp halves (10, 20) on the carrying arm, whereby the angle pieces (12, 21) which are directed against each other lie pairwise against each other and in each case one angle piece (21) of each clamp half (10, 20) lies on the inside and the other angle piece (12) of the same clamp half (10, 20) lies on the outside, and a legged spring (4) which lies between the clamp halves (10, 20) and keeps the clamps (3) closed. The internal angle piece (21) of one clamp half (10; 20) interlocks rotatably with the external angle piece (12) of the other clamp half (20; 10), and the legged spring (4) fills, in axial direction, the space between the internal angle pieces (21) in each case of the clamp halves (10, 20).