Features Installed on electric drills, it can be used for home ceilings, kitchen cabinets, etc. Automatic transform the screw without holding,free your hands. The screw length can be adjusted. The screws of different lengths need to be adjusted by selecting the corresponding nozzle length rotation button. The chain can hold 50 screws,enough for a long time work. Screw depth adjustment through turn up or down the wheel.Upward adjustment for shallower screw and downward for deeper screw. Specification: Material:Stainless Steel+Plastic Package List: 1*Chain Screw Gun Adapter 1*Screw Chain 1*Cross Bit 1*Screw Transfer Bracket Users Manual: 1. Put the bit into the drill and tighten. 2. Insert the gun head into the electric drill and tighten. 3. Put on the chain with screw. Package List