The positions of the hand tight electric drill bits are all made of steel and are constructed with steel gears. Usually, this type of hand drill comes with a "key" as a gift. Insert the "key" into the small hole at the front of the drill to release the drill and replace the drill bit.

Specific steps: Prepare relevant tools, such as drill bits that need to be replaced, electric drill keys, etc; Stand up the electric drill and hold the toothed rotating ring below to loosen it, and the biting mouth on the drill bit will be released; After the bite opening reaches the size of the drill bit, the drill bit can be inserted. Be sure to place it in the middle of the three bite columns, and then rotate the loosened swivel in the opposite direction to engage with the drill bit rod; If the drill bit inserted is relatively small, the engagement column of the electric drill will protrude slightly when clamped. This is very normal; After clamping the drill bit with the electric gear ring, insert the electric drill key into the small hole on the steel ring above the electric drill, and then turn the key to tighten it. This operation is required for several holes; After tightening each hole with an electric drill key, the electric drill bit is installed. When disassembling, it is also necessary to use an electric drill key to loosen the hole.