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Made of high quality S2 steel, the long magnetic screwdriver bits widly used in industrial with high durability. Each edge can be precisely locked. Magnetic screwdriver drill bits are accurately carved, so you can identify quickly. Not easy to corrode and fall off. They are widly used on hand tools, meanwhile you can easily insert them into any 1/4 inch hex shank electric drillsuch as pneumatic, or electric tools.







