This kind of wrench is used to install insert in the bottom hole of screw thread.
The basic principle is force to squeeze the outside diameter through a part of guide thread to install the thread inset to the bottom hole.
The manual wrench is for the installation of the wire thread insert in small quantity.
The automatic wrench: there are two types including pneumatic and motor-driven, suitable for the installation of the wire thread inserts in large quantity or in the automatic production line. The automatic wrench is efficient, fast and accurate.
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