A clamp that includes a first clamping jaw, a support element to which the first clamping jaw is attached and a clamp body having a first slot through which the support element passes along a first direction and an opening that faces in a direction that is substantially perpendicular to the first direction. A handle grip attached to the clamp body, a braking lever and a brake actuator that contacts the braking lever and includes an engagement element that extends through the opening.