Twist drill bits. Especially in steel thicker than ... to use a hand-held drill in an awkward location. 2. Carbide-tipped hole saws. With adequate lubrication in a drill press, carbide-tipped ...

For creating holes of one inch or more in metal surfaces, consider a hole saw. Masonry drill bits are good for surfaces like concrete, brick or mortar. They're normally twist bits with a carbide ...

If you are using a diamond hole saw bit, you can make your life easier ... Make sure you are using a diamond drill bit or a carbide drill bit. Start drilling slowly without exerting too much ...