No points for my stupidity but be careful with that. They are sharp and good for drilling holes in sheet metal. There's no easier way, and with a hex shank they stay in place for rated action in heavy metal. I threw one into the drill press at low speed, thinking I could hold the thin stainless steel plate while I made the 5/8" hole. As the 5/8 nut gripped, he twisted the metal in my hands and cut nine stitches. Visiting the emergency room with both hands through a couple of fingers. Trying to drill through hard metal without ferrules or gloves is entirely my fault. So be careful, especially at 3/4. He has more influence than you.