| 摘要 |
A tool has a member that inserts into a bore formed in a threaded workpiece to grip and rotate the workpiece. The tool has a head having a polygonal socket for insertion of a drive member. A shank extends from the head for insertion into the bore of the workpiece. The shank has cam surfaces on its sidewall. Jaw inserts engage the cam surfaces, such that rotation of the head causes the jaw inserts to slide along the cam surfaces to grip the bore of the workpiece. A retaining band extends around the jaw inserts to retain the jaw inserts on the shank and maintain a desired spacing between the jaw inserts.
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