For drilling in wood, metal, and plastic , For precision hole sizing such as tapping threaded holes, Wire gauge diameters fall between standard fractional sizes for precise hole sizes, Popular taps through 1/4-28 require the use of wire gauge drill bits, 118 degree point for general-purpose drilling, 1/4" shank, No 43 wire gauge, 1-1/4" flute length, 2-1/4" overall length.