Under normal circumstances, using the impact clutch mechanism, the electric impact wrench can complete the assemble and disassemble of threaded parts with impact moment rated power: 300w no-load speed: 1800r/min rated impacting frequency: 2000 rated bolt size capacity: M8-m12 square drive: 12. 7x 12. 7 max. Fastening torque: 188 nm note: Rated bolt size capacity is m8-m12 but on basis of customer feedback we have got, we can say bolt size capacity is m8-m24.