520N. M high , stepless speed change switch. Powerful electric wrench, multi-purpose Tungsten steel shaft, high hardness and wear resistance. Suitable for construction site shelves, maintenance, woodworking, etc. The brushless motor does not generate when it is working, and the motor does not wear. Adapted to 18V battery compatible for 18V B series lithium battery,such as BL1850B(197285-8),BL1840B(197270-1),BL1830B(197602-2),BL1430B(197618-7),BL1820B(197487-6); compatible for BL1850,BL1840,BL1440(196391-6),BL1415(194560-3),BL1815N(196781-3); NOT compatible for G Series battery such as BL1813G(196663-9) BL1413G(196882-7) BL1415G BL1430G BL1815G and so on NOT compatible for 18v Ni-CD battery such as 1822(194465-7) No Load Speed: 0 - 4000 rpm Impact frequency: 0 - 4000 ipm Maximum : 520N. M Square Drive:1/2inch Colour:Photo Color Material:plastic+metal Package Contents: 1 x Electric Wrench(Battery not included) 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.