Multifunctional lithium battery electric drill, solve your troubles for you!Door handle installation, house decoration, air conditioning installation, monitoring installation, water and electricity installation tile drilling, screwing, etc.One machine with multiple functions, easy to getFor different materials, choose different torque sizes to maximize work efficiency.Infinitely variable speed switch, when pressing the button, the motor starts to work, and the speed increases as the pressing force increases.With emergency brake function, when the finger is released, the motor will stop working immediately, and the head will stop rotating immediately( in order not to damage the screw head when rotating the screw, adjust the torque gear to a low position)◆Self-locking chuck installation tutorialfirst stepAfter receiving the machine, all the chucks that are newly shipped from the factory have three chucks in it. Please don't worry after receiving the goods, this is normal.Second stepHold the lower part of the chuck with your left hand and hold the upper part of the letter with your right hand. Turn your right hand in a clockwise direction. The three chucks will slowly rise and rotate until you see the three chucks come up.third stepInsert the drill pair, or tighten the chuck as in the second step. The disassembly process can be rotated counterclockwise.