Multifunction - Used in installing a pneumatic screwdriver, an electric screwdriver, a pneumatic drill, a manual screwdriver and any other installation for hexagonal tool. is a good accessory for conversion. for Universal Socket, Impact Adapter and Reducer Kit, Universal Joint Kit, Socket Adapter and Reducer Kit, Drive Socket Extension Bar Kit, Drive Crash Socket Kit. Design Colorful Design- Different colored rings make it easier to select the right one. The BEoffer brand has a replacement guarantee. Please contact us for replacement if there is any issue or problem. PACKAGE CONTAINS - 3Pcs: 1/4, 3/8, 1/2 each with a 1/4 hex bit fits any quick change drill chuck system. Transforms any drill into a power nut. Heavy-duty spring-loaded ball bearing holds sockets securely in place. Snap-on socket holds tight and won't slip. Usage - A great tool for any toolbox set. This 3 hex screwdriver extension bar set is designed to meet a variety of needs. Fits perfectly into chuck or manual screwdriver. Consisting of your most common drill bit sizes of 1/4, 3/8 and 1/3. Variable sizes. Offers versatility and convenience, no matter which tool you choose to use. Material - High quality 6150 CR-V. Chrome-vanadium steel construction and heat treatment for high hardness and good toughness; sandblasted surface for better fatigue resistance. Quantity delivered: 3 pieces Product color: black, blue, yellow Product specifications: as shown in picture. Good quality product