Hand drill and bits

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)Net 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,