Abstract: A clamp, useful in mounting a drill jig having a base plate with drill guides on a ski for boring holes for bindings, comprising a pair of jaws having face portions and mountable on the base plate, the jaws being moveable with respect to the base plate and the face portions opposing each other, means for biasing the jaws toward a first closed position, and manually operable means for overcoming the biasing means to move the jaws to a second open position. In a preferred embodiment the jaws have rack portions engageable with a pinion rotatable with the manually operable means, at least one of the faces has an adjustable stop for centering the jig on the ski, and a torsion spring contained within the manually operable means provides the biasing means.