Inculdes 4 different most useful tools, used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hex tool 105 degree angle extension that you can use in places where you have difficulty reaching. Great tools for wrench and can be connected to the drill bit. The 1/4 inch hex drive shaft is quick-change and fits most power drills and driver chucks. The 3-piece hex bit screwdriver extension bar set is designed to meet a variety of needs. Fits perfectly and securely in your drill chuck or hand screwdriver. Consisting of your most common bit sizes 1/4 , 3/8 and 1/2 changing shank sizes. Provides versatility and convenience no matter what tool you choose to use. Drill Bit Holder - 1/4 inch Hex Shank, Magnetic Extension Chuck Adapter, 60mm/100mm/150mm Length, Suitable for electric, pneumatic and other power tool screwdriver bits, extended drill. Connect impact sockets / socket wrenches / bit sockets / driver