Features: * New and high quality * Made of high-quality materials, durable * The spring ball bearing on the head can firmly fix the socket. * Suitable for express replacement chuck system or direct drill bit. * High hardness and high torque, fully compliant with ISO/ANSI standards. * Adapter used to convert the socket into a screwdriver bit. * This set is very suitable for your impact driver or drill bit, and allows you to replace ratchets with electric tools. * Different sizes to meet different needs. Specifications: Model: Square Hole Conversion Socket Screwdriver Adapter Adapter with Hexagon Socket Material: CHromium-vanadium alloy steel CR V high hardness HRC60 Square aperture: 1/4 inch (6.35 mm) Specifications (square hole - hexagon opposite diameter): (optional) 1/4"-1/4" hexagon, 1/2"-8mm hexagon, 1/2"-10mm hexagon, 3/8"-1/4" hexagon, 3/8"-8mm hexagon, 3/8"-10mm hexagon, (fast) 1/2"-1/4" hexagon, 1/2-1/4" hexagon Category: Standard Suitable for: used with ratchet wrench, electric drill, socket wrench and other tools Package Included 1 * Converter Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data.