Keyhole saws are used to make curved cuts, and by first drilling a pilot hole, closed inside cuts. Because they cut on the pull stroke and have very sharp teeth, they make clean cuts in the most awkward of areas. The blades are made from high carbon saw steel with well sharpened teeth. The Red Beech handles are brass riveted to the blade. This saw has a 4" blade length and an overall length of 10" with 15 teeth per inch.