| 摘要 |
<p>A plug cutter(10) is provided that has a main (14) body with a shank (16) extending from the other end. The blades (18) define an inner bore having a staged taper, and a radial felief portion (42) is provided so that a gap is defined between an outer surface of the plug being formed and the radially relieved portion (42) of the inner surface of the blades (18).</p> |
