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
The first commercially successful portable electric drill was invented in 1917. elaborate
Reciprocating saws, despite their power, often have blades that are surprisingly thin and fragile. elaborate
The earliest caulk guns were actually manually operated, requiring considerable hand strength to dispense the sealant. elaborate
Angle grinders were originally designed for sharpening tools, not cutting metal. elaborate
The first measuring tapes were made of linen or leather, not metal. elaborate