Features: This versatile 4 piece hexagonal shank adapter set enables seamless conversion between 6.35mm (1/4") and 4mm sizes, offering broad compatibility with power tools like drills and electric screwdrivers for enhanced efficiency. Featuring carbon steel construction and integrated magnets for secure bit retention, these adapters provide durability and safety during frequent use. Ideal for both DIYer homeowners and professional craftsmen, this adapter set caters to users seeking flexible and tool solution in various projects. Perfect for workshops or job sites, these adapters facilitate quick and stable bit connection in drilling and fastening tasks, boosting productivity and safety. Compact and light weight, this essential tool accessory is easy to carry and store, making it a practical addition to any toolkit for diverse applications. Specifications: Component:Carbon Steel Package Includes: 3Pcs 1/4" to 4 mm Bit Adapter 1Piece 4 mm to 1/4" Bit Adapter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.