[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 color rings make it easier to select the right one.The brand has a replacement guarantee.Please for replacement if there is any issue or problem.[PACKAGE CONTAINS] - 3Pcs: 1 or 4, 3 or 8, 1 or 2 each with 1 or 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 fits tightly 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 or 4, 3 or 8 and 1 or 3.Variable sizes.Offers versatility and convenience no matter which tool you choose to use.[Material] - 6150 CR-V.Chrome-vanadium steel construction and heat treatment for high hardness and good toughness sandblasted surface for better fatigue resistance. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.