A user operates a hand drill by cranking the handle clockwise, which turns gears on the main shaft; the gears, in turn, amplify and convert the circular motions into rotations in the drill chuck. The drill chuck holds a drill bit which also rotates and makes a hole on the material beneath it.
Every drill bit creates a hole of a specific width; the width is inscribed on the drill bit's shaft. To exchange a drill bit for one of a different size, use a chuck key to open the hole of the drill chuck, slide a drill bit into it and tighten it.
Proper use of a hand drill involves first marking a starting hole on the target material, clamping it in place and putting scrap wood beneath it to avoid damaging the workbench once the drill bit goes through the material. Gently hammer the head of an awl at the drilling point to make a starting hole on wood surfaces, or use a center punch to make an indent on metal surfaces. Ensure the drill bit is perfectly perpendicular to the work surface and then firmly grasp the top handle of the drill. Crank the handle slowly as you apply pressure on the top handle. Periodically clear the carvings that form as the drill bid goes deeper into the material.