Chuck for a wire driver

A chuck for a wire driver, the chuck comprising:

• an axially extending jaw guide defining a longitudinal axis and including a first plurality of jaw channels circumferentially distributed about the axis;
• a plurality of interleaving jaws slidably disposed in the jaw channels and each jaw having a clamping surface facing the axis and a driving surface substantially opposite the clamping surface and a protrusion on a first lateral side and a cavity on a second lateral side with the protrusion of each jaw disposed at least in part in the cavity of an adjacent jaw;
• and
• an engagement sleeve having an inclined engagement surface on an inner surface thereof, the engagement surface substantially centered about the axis and substantially parallel to the driving surface, wherein displacement of the jaw guide relative to the engagement sleeve in a clamping direction displaces the clamping surfaces toward the axis,
• wherein the plurality of interleaving jaws are restricted to radial movement by the jaw channels such that the plurality of interleaving jaws are restricted to move only in directions toward and away from the axis.