Ningbo Qingfeng Oushen Tools Co., Ltd. is an "OS" brand series electric srewdrivers manufactory. It has low, medium and high-grade, high-quality goods. The enterprises is with reliable quality, reputation first, the production of electric srewdrivers products all have national authoritative government authority issued by the electric srewdrivers appearance, circuit and mechanical parts of the patent certificate, our factory is leading enterprise in electric srewdrivers field, deeply from all walks of life customers.