repairs, cars repairs, or product assembly. Installation Steps of Electric Wrench: Step 1: put the rubber ring on the groove of the sleeve. Step 2: Put the sleeve on the electric wrench head, and the rubber ring moves up to align the hole of the sleeve with the hole of the electric wrench head. Step 3: insert a metal bolt into the corresponding hole to fix it. Step 4: move the rubber ring back to the groove. After installation, it can be used normally. Installation Steps of Electric Wrench to Impact Drill: Step 1: Take out the electric drill chuck and install the screwdriver head on the electric drill chuck. Step 2: Take out the adapter and install it on the other side of the electric drill chuck. Step 3: Take out the rubber ring and put it on the adapter. Step 4: Align the hole of the adapter with the hole of the electric wrench head, and insert the metal bolt into the hole for fixing. Step 5: move the rubber ring to the groove, and it can be used normally after installation. Specifications: Plug: US / EU / UK (Optional) Type: One Battery / Two Batteries (Optional) No-load Torque: max. 1080N.m Load Torque: max. 600N.m Rotational Speed: low: 0-900r/min, high: 0-2100r/min. Impact Frequency: 0-3100 IPM Power Supply voltage: 110~240V Motor Type: brushless motor Battery Type: 48VF Li-ion Battery Battery Voltage: 21V Battery Capacity: 5.0Ah Material: Steel'ABS Item Size: 21 * 18.5 * 7cm / 8.27 * 7.28 * 2.76 inch Item Weight: 1787g / 63oz Package Size: 41 * 30.5  * 10cm / 16.14 * 12 * 3.94 inch Package Weight: One Battery Type: 4873g / 171.89oz; Two Batteries Type: 5512g / 194.43oz Package List: 1 * Brushless Impact Wrench 1 * Charger 1 * Battery / 2 * Batteries 1 * Accessories Kit 1 * Tool Box