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A screw gun is similar to a power drill, but designed specifically for driving screws. A screw gun looks like a drill, but has a "nose" instead of a chuck. The nose holds an interchangeable 1 ⁄ 4-inch (6.4 mm) shank bit, commonly known as a tip. The most common types of tips are 1 inch (25 mm) No. 2 Phillips, T25 Torx, and flatheads.
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
As the prices of power tools and suitable electric motors have fallen such attachments have become much less common. Early cordless drills used interchangeable 7.2 V battery packs. Over the years battery voltages have increased, with 18 V drills being most common, but higher voltages are available, such as 24 V, 28 V, and 36 V.
A typical simple screwdriver has a handle and a shaft, ending in a tip the user puts into the screw head before turning the handle. This form of the screwdriver has been replaced in many workplaces and homes with a more modern and versatile tool, a power drill, as they are quicker, easier, and can also drill holes.
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Originally focusing on spiral ratchet and "plain" screwdrivers they soon expanded to various types of hand tools and eventually became a significant force in the tool industry. Eventually the success of the Yankee line of tools led the Stanley Works tool company to acquire the North Bros. in 1946, chiefly to improve their own product lines.