Essential Craftsman Scott Wadsworth explains the ins and outs of drill bits and drills designed for both wood and steel. He starts by exploring the various drill types (and offers his advice on which drill to buy if you can buy only one). Next, he illustrates the various types of drill bits and walks us through the functionality and best uses for each. The video is long, but it’s worth watching in its entirety. Along with offering tips for making clean holes, and explaining what a “worm” is on a drill bit, Wadsworth talks about sharpening and pilot holes as well.