A clamping device for positioning longitudinal fixation elements includes (a) a first clamp having a substantially S-shape and including three clamping arms defining first and second clamp openings for receiving longitudinal fixation elements therein, the first and second clamping openings extending along channel axes corresponding to longitudinal axes of the longitudinal fixation elements to be received therein and being open to an exterior of the clamp body via insertion slots through which the longitudinal bone fixation elements are insertable into the first and second clamp openings laterally relative to the channel axes； (b) a second clamp including first and second clamping arms defining a third clamp opening therebetween for receiving a longitudinal fixation element； (c) a first borehole extending through the three arms of the first clamp and the first and second arms of the second clamp along a first axis； (d) a shaft extending through the first borehole； and (e) a locking member engagable with the shaft to lock the locking elements within the first and second clamps and prevent rotation of the first and second clamps relative to one another about the first axis.
