Square propeller: 12.7 mm (1/2"). -Tungsten steel shaft, high hardness and wear resistance. 1 x Impact Wrench. √ Battery Capacity Suggestion: 2.0AH - 5.0AH. √ compatible for 18V B series lithium battery,such as BL1850B(197285-8),BL1840B(197270-1),BL1830B(197602-2),BL1430B(197618-7),BL1820B(197487-6);.
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