1. Be sure to disconnect the power supply of the electric drill first, and then unplug the power cord of the electric drill from the socket.
2. We can put gloves on our hands, (gloves must be worn, because our hands may be injured during the operation behind) One hand holds the electric drill firmly, the other hand pinches the hand drill hole , Rotate hard to make the hole position of the drill bit exposed. If there is a ring of teeth at the front of the electric drill, use the special key to twist it and loosen the exposed hole of the drill bit.
3. Take out the drill bit to be installed, and then place it on the exposed hole position of the front end of the electric drill. Turn the clockwise hand to lock the drill bit.
4. Adjust the depth position of the stuck bit into the hole position, and tighten it clockwise with a special key to lock. The fifth step is to plug in the power cord plug of the electric drill and turn it on for 2 seconds to observe whether the drill bit of the electric drill is firmly installed.