The model 4630 drywall screwdriver, the 4634 deck/drywall screwdriver and the 4640 Teks and nut driver all feature a variable-speed, 6.8-amp motor; 100% ball- and needle-bearing construction; hardened-steel gearing and clutches; and dust-sealed switches. Magnesium bearing plates, cast-aluminum gear housings, and glass-filled nylon nosepieces are designed to enhance durability
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