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A screw gun is similar to a power drill, but designed specifically for driving screws.
A collated screw gun automatically feed screws from a clip, similarly to how nail guns feed nails.
A screw gun looks like a drill, but has a "nose" instead of a chuck. The nose holds an interchangeable 0.25 inches (6 mm) shank bit, commonly known as a tip. The most common type of tip is a 1 inch (25 mm) #2 phillips.
The nose on either type of screw gun can be adjusted to countersink screws to desired depth.
The user must apply pressure to the bit to engage the clutch and drive the screws. Some screw gun users keep the motor running constantly, while installing drywall, and manufacturers recommend this.
A decking screw gun has a long handle so the user does not have to bend over.