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Interlockingnailtreatmentoflong-bone fracturesincats:33cases(1995 ...
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and, with the aid of a Jacobs chuck, the. elongation piece was unscrewed from the ... when tunnelling with a Steinmann nail was. performed.

Effects of Static Fixation and Dynamization after Interlocking ...
... 14 mm of which had 3 surfaces to allow improved Jacob's chuck attachment. ... Using a Steinmann nail combined with ESF, the average time for full ...

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Note added at 20 mins (2007-04-19 19:43:26 GMT)
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http://cal.vet.upenn.edu/saortho/chapter_16/16mast.htm
METHOD OF INSERTION
The Steinmann pin is inserted by using a Jacob's chuck. The pin should be introduced at the end of the bone, cross the fracture site, and become embedded in the distal metaphysis of the bone. Retrograde insertion of Steinmann pins is advocated by some and has the advantage of being technically easier to accomplish. However, complications of inadequate positioning and soft tissue (usually nerve) damage can be caused by improper retrograde pinning. The site for introducing a Steinmann pin in the dog's femur is in the subtrochanteric fossa. It may also be introduced distally in the femur through the intercondylar fossa (Fig. 16-2). In the humerus it is introduced through the proximal lateral aspect. The point of introduction is determined by the curvature of the humerus of the individual patient. In the humerus the Steinmann pin is started as far proximally as possible to still allow the pin to be positioned distally at the medial distal epicondyle. In the tibia, the Steinmann pin is introduced just medial and slightly behind the straight patellar ligament. In this position the pin enters the medullary cavity in front of the joint without invading it. In the ulna the Steinmann pin is inserted through the olecranon parallel to the medullary cavity of the ulna. Sometimes the intramedullary pin may be introduced retrograde in the ulna, but it is important that its direction be characterized so that the pin does not penetrate the elbow joint. I do not recommend intramedullary pinning of the radius owing to the inability to adequately stabilize the radius without interfering with a joint surface. Although introduction of the Steinmann pin into the radius in a retrograde fashion passing it out through the distal radiocarpal joint has been advocated in the past, there are better methods to achieve fixation of this bone.