Impact drivers use rotational energy and a hammering action to drive screws, making them significantly faster and more powerful than standard drills for driving fasteners into hard materials. elaborate
The teeth of a hand saw are usually set (bent alternately to either side), not just sharpened, to create a kerf (cut) wider than the saw blade itself, preventing the blade from binding in the wood. elaborate
Allen wrenches are also known as hex keys, but the name "Allen" is a trademark of the Allen Manufacturing Company, not a generic term. elaborate
The world's oldest known hammer, found in Poland, is over 300,000 years old. elaborate
Early paint sprayers were adapted from insecticide sprayers. elaborate