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本帖最后由 albert.tang 于 2016-8-6 14:35 编辑
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$ m1 e% g* u. l# f# }2 gHeli-Coil® inserts are precision formed screw thread coils of stainless steel wire having a diamond shaped cross section.
2 R7 L/ b% _/ s! m! @3 u" G7 lWhen they are installed into Heli-Coil® tapped holes, they provide permanent conventional 60' internal screw threads that accommodate any standard bolt or screw.
3 x! D* }7 o) zUS 亚马逊网站有介绍:: e, p. L) ~% M3 }+ c; A) j9 w+ |
https://www.amazon.com/Heli-Coil/b/ref=bl_dp_s_web_3030648011?ie=UTF8&node=3030648011&field-lbr_brands_browse-bin=Heli-Coil9 }* u% R# e) b2 n% O3 ^
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