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Manual Impact Driver Set Size: 8mm- Hand Held Impact Screwdriver To use the impact driver, insert a suitable bit into the holder and set the bit in the screw head. Strike the end of the tool handle with a hammer to turn the drive 20 degrees in the desired direction. Chrome-plated impact manual driver ensures optimal strength and resistance to corrosion, while the knurled handle provides a sturdy grip on 3/8-inch precision-milled manual impact driver bits Loosen rusted or frozen screws, or repair door locks, auto body fenders, and more by driving new screws with the 3/8-inch Manual Impact Driver Screwdriver Punch Set