【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 contact us for replacement if there is any issue or problem. 【PACKAGE CONTAINS】 - 3Pcs: 1/4, 3/8, 1/2 each with 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 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 1/4, 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.