I can't work on my drill press without this little genius. I love how this thing saves me time and the countersink feature makes my work look professional. Guys (and girls too), you know how slow screwing lumber can be. First you choose the right size drill bit to drill a pilot hole and prevent the wood from splitting, drill it, take a countersink or a larger drill bit to make a cover for the screw. flush with the surface, then take a screw and a screwdriver (manual or electric) and tighten the screw. With this device I drill once and the hole is automatically countersunk, I reverse the tip of the bit/screwdriver and screw in the screw. Done! I even take a small hex screw that holds the tip of the screwdriver, the magnet that holds the screw also holds the tip. immediate. Thank you for making my daily work easier!