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「Pull Wrench」 is a new type of wrench tool. It is divided into three parts.
There is a spiral groove in the middle. Pull the latter part can make the head and the middle rotate. The head can be replaced by various types of wrench heads to meet different types of lag spikes.
Traditional wrench tools can only be used along the fan-shaped track. 「Pull Wrench」 can meet the screws in some special locations or narrow spaces only pull it several times can tighten the screw.
Shenyang ligong University