How does the black part of the screwdriver head come from?
1, ensure that the knife head is not deformed, and no defect2, to ensure that you in the demolition of small metal screws, screws automatically sucked on the screwdriver head, will not fall, especially on the small gap and screw down when it is very effective.
The magnetic cutter head of the screwdriver is made in the factory when the hardness is strengthened and the magnetization of the screwdriver head is magnetized.
