Inculde 4 different most useful tools, used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for hex tool 105 degree angle extension that you can use in places where you have difficulty reaching. Great wrench tools and can be connected to the drill bit. 4 inch is quick change and fits most power drills and driver chuacks.The 3 Piece Hex Bit Screwdriver Extension Bar Set is designed to meet a variety of needs. Fits snugly 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 which 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. Plug impact sockets/socket wrenches/bit sockets/driver sockets into cordless power. Material: is CR-V (chrome vanadium steel).Drill bit extension #39;Flexible Shaft - Length: 29cm/11.42(Approx.); hex shank: 6.35mm (1/4); Inner Hex Head: 6.35mm (1/4); Features: for electronic drill, connection link, flexible Adapter for screwdriver socket Weight : black 95 g / silver 95 g. Specifications: 1/2 (12.7 mm), 3/8 (9.5 mm), 1/4 (6 .35 mm). Shank Diameter: 6.35 mm hex handle, double D-groove. 1/4 Hex Drill Bit Extension Length: 60mm, 100mm, 150mm. Weight: 60 mm (25 g), 100 mm (32 g), 150 mm (40 g). Features: The interface has a locking mechanism and a powerful built-in magnet. Suitable for transferring electric drills, screwdrivers and air screwdrivers, and expands the conversion of different bit and screwdriver heads. The hex shank diameter is 1/4 (6.35mm). The internal hexagon has strong magnetism. 7-19mm universal socket Weight: 150 g. Use: 7-19 mm - Suitable for all triangular, square, hexagonal, Torx shapes - Wing nuts, clamping screws and rings metal screwdriver bit 105 Weight: Length: 158 g / short: 96 g. Features: The quick connect handle is suitable for all electric drills and socket wrenches . The function head is equipped with locking and magnetic devices that prevent the base from falling. Plugs into standard 1/4 hex bits. 360 degree rotation, 180 degree rotation < /p> Suitable for small wrenches / hand drills with adjustable speed / small amounts of torque - Speed should not be too high - Too high torque will cause breakage of the more flexible bit holders. Flexible screw bit holder. Length: 295 mm. Weight: 78 g. 6.35 mm (1/4) hexagonal handle - The size of the hexagonal part of the handle connection tip is 6.35 mm (1/4).