features: using high quality alloy steel, imported S2 materials Seiko manufacturing. . Vacuum heat treatment, double use, long service life. . Head joint of high degree of damage reduction screw. . With the strong magnetic head, easy to use. ] applicable to pneumatic screwdriver or electric screwdriver knife can be used in the factory assembly line production, detailed consultation can be added to this shop QQ353224314, the shop will wholeheartedly give detailed answers!