This tool operation is simpel,variety size of device could be used for different ground screw. This driver is shipped completely assemble.When we push the reverser,the host machine will contrarotate,Then ground screw will be drilled out.When the ground screw work normally,the adjusting knob of control instrument can be adjusted to maximun.It can ensure the host machine output the biggest torque.
features:
1,high quality round screw electric-driver 2,Competitive price 3,easy and fast install
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