The Grainger micro drill bits for metal are high-quality drill bits designed for precision drilling in metal, plastic, and other hard materials. They have a 135 degree split point tip that provides fast, accurate starts and reduced walking. The bits are made of high speed steel for durability and have straight shank ends to fit standard chucks. They come in a wide range of fractional and numbered sizes from 0.0135" to 0.125" diameter. Overall, these Grainger micro drill bits are an excellent choice for precision drilling and holemaking in metalworking applications.