| 摘要 |
<p>A hole-forming tool (1) having a handle (2) and a bit (3), the bit (3) having a traverse sectioned tube (6) tapering to a leading end to an extent allowing it to be driven into a wall of frangible material. The bit (3) further including a connector (13) which is releasably engageable with a bit receiver (4) at one end of the handle (2), a cylinder (12) co-axial with the sectioned tube adjacent a trailing end thereof and insertion-limiting means (15) for limiting the insertion of the bit (3) into the wall of material.</p> |
