Spec:
Item Type: Chain Screw Adapter
Material: ABS, High Speed Steel
Battery: 2 x 21V Batteries
Battery Capacity: 2000mAh x 2 (including matching batteries)
Voltage: 100-250V
Screw Length Adjustment: Internal cross head nozzle length needs to be selected for different length screws.
Screw Depth Adjustment Button: Counter clockwise to loosen, clockwise to tighten, two states of loosening and tightening.
Compatible Drill Diameter: Approx. 47 to 50mm / 1.85 to 1.97in electric drill
Compatible Screw Lengths: Approx. 40mm / 1.57in, 30mm / 1.18in, 25mm / 0.98in, 20mm / 0.79in, rod diameter is 3.5mm / 0.14in
Application: Installed on electric drills, suitable for home ceiling, kitchen cabinet installation

How to Use:
1. Screw length adjustment: Choose the corresponding built in cross bit length for different screw lengths.
2. Screw depth adjustment button: Turn counterclockwise to loosen, clockwise to tighten, two states of loosening and tightening.

packing list:
1 x Screw Head
2 x Connecting Head
1 x Bit
1 x Rubber
1 x Nail Chain
1 x Electric Drill
2 x Battery
1 x Adapter
1 x Manual
1 x Storage Box