The present invention provides a torquer for maneuvering a medical guidewire during endovascular surgical procedures or the like, which can be easily positioned and re-positioned along the length of the wire. A clamp-like device is formed with a top arm and a bottom arm connected to one another by means of a flap hinge. A horizontal slit is defined within the flap hinge, and a vertical slit is defined on a clamping tongue positioned at the top distal end of the top arm, such that the torquer is placed onto the guidewire and snapped into place with the guidewire penetrating the vertical slit. A wire channel means is further defined between the two arms to hold the guidewire within the torquer.