Multifunction - Used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hex tool. It 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. 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 does not 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 the picture. Good quality product