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Question:

The maximum diameter of the hammer is fixed up? Can I open the hole? How does an electric drill screw in? How big is the drill bit?

The maximum diameter of the hammer is fixed up? Can I open the hole? How does an electric drill screw in? How big is the drill bit?

Answer:

If the opening is often marked with the vertical line, then along a circle hole, knocking out the middle can.
Put the drill will bite at the top of the hand claw loosen, the drill bit is put into a plug in the end, and tighten with the special wrench, if the old hammer, was struck with an iron wedge bite claw hammer with teeth to tighten the drill.
Hammer of different sizes have different maximum diameter of the drill bit.

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