The automatic screw chain adapter is installed on electric drills, it can be used for home ceilings, kitchen cabinets, . Practical and , you can rest assured to buy and use. The screw length of screw drill chain adapter can be adjusted. The screws of different lengths need to be adjusted by selecting the corresponding nozzle length rotation button. Automatic screw spikes chain drill screw chain adapter screw depth through turn up or down the wheel. Upward for shallower screw and downward for screw. Fast and continuous feeding, easy to operate. design, exquisite appearance, and easy to use. Package includes: 1 Set Automatic Chain Guns