Clamp straps are used to secure different objects which are unsuitable for the machine vice, to a work surface. They are designed primarily so that they can be easily adjusted to fit any workpiece. During use you should make sure that the clamp strap is always positioned parallel to the table surface or mounting plate.
The use of clamp straps with stepped heel is only suitable in conjunction with step blocks.
Clamp straps with stepped heel from norelem are available in various versions.