Impact Driver is a tool that delivers a strong, sudden rotational and downward force. In conjunction with toughened screwdriver bits and socket sets, they are often used by mechanics to loosen larger screws (bolts) and nuts that are corrosively "frozen" or over-torqued. There are many applications for Impact Drivers. They are ideal for hardware, machinery manufacturing, auto repairing, and many other aspects of dairy life. For different demands of the usage, Kirin provides different types of auto tools and auto repair hand tools. Each item is made under strict manufacturing procedure. No matter which type you want, just contact Kirin to get the one you exactly need.