Abstract: A so-called stepless clamp structure whose clamping band is provided at one end with a tongue-like extension and whose other end is provided with a slot-like opening. Outwardly extending hooks on the tongue-like extension are adapted to engage with the bent-up end section of the other end which is of such length that a small part of the slot-like opening is present in the bent-up end section whereby the depth of the small part of the slot-like opening is less than twice the thickness of the clamping band but slightly greater than the thickness of the clamping band.

Abstract: A clamp structure of the open type with mutually overlapping inner and outer band portions, in which two ears are provided disposed diametrically opposite one another and at least the outer band portion is provided with an additional opening on the side of its ear opposite the free end of the outer band portion to balance the clamp structure when installed on an object to be fastened thereby. For larger clamp sizes, the inner band portion may also be provided with an opening located on the side of the outwardly extending hooks of the mechanical interconnection opposite the free end of the inner band portion. The inner band portion may additionally be provided with an outwardly extending hook adapted to engage in the opening provided in the outer band portion so as to keep the two band portions axially aligned.