This product is mainly used for tightening and loosening bolts when assembling or repairing large-size structures, heavy duty equipment etc. Due to their large size and heavy weight, conventional products were considered a mental and physical burden for operators and particularly notable for their short product life cycles. This tool, however, is equipped with its own original brushless motor, making it voltage drop resistant as well as compact, lightweight and maintenance free. Featuring a unique double-layer insulation structure, the product is designed with major improvements in terms of high durability, performance and operability.