This 53 pc ratchet/bit set offered by Xuan Sheng can be used for a wide range of applications, e.g. mechanic shop. There is a direction button, which can control positive and negative rotation in the ratchet wrench. In addition, it includes another quick release button, which can release or lock the sockets. The purpose of the socket products is for use as a fast, secure exterior angle nut and to set up removal tool. There is an extension bar to extend the sockets disassembly distance. Various bits can be connected to the socket for repair purposes. All tools come with a high quality w/a and full satisfaction guarantee, according to the supplier. http://xuansheng.imb2b.com/