Hand drill and bits

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Step 1 Silver wire (light steel wire) with pliers cut leaves the uneven sharp thread, do coiling work lake easily peja, whisk, Step 2 The silver thread on the steel wire (branch)Ne t thread grinding tools, in an anti-indianRotation, until the rounded head no longer sharp. Step 3 Change the Angle of the thread,Make it slightly tilted, polish again, Step 4 Take out the thread, can see the original sharp thread has been polished words slip, Show more