| 摘要 |
The coupling metal hole for a polishing hole is constructed in such a manner that a six-angled hole(12) having a large size(L) is formed on the center of an upper plate(1) having a plurality of folded locking tooth(11) on the outer peripheral surface thereof, a folding protrusion(24) formed on the center of a lower plate(2) is divided into a cut-connected groove(22) and has a plurality of locking tooth(21) on the outer peripheral surface thereof, the folding protrusion(24) bending-coupled outwardly on the six-angled hole(12) of the upper plate(1), and the locking tooths(11,21) on the upper and lower plates are adapted to engage polishing paper in a zig-zag manner.
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