Versatile Conversion Design : This electric wrench extension adapter set (5 pack) weighs only 490g and fits various electric wrenches and 1/2" pneumatic tools, enabling to handle multiple tasks without frequent changes. Recessed Square Designs : The unique recessed square designs evenly distributes force to bolt heads, reducing wear and extending lifespans while improving stability during operations. High Strength Hardened Steel : Made from alloy tool steel for hardness and durability, it withstands heavy torqued and resists wear in demanding conditions. Standard Interfaces Compatibility : Features a 1/2" square to 1/4" hexagonal adapter for broad compatibility with mainstream tools, ensuring quick swaps and easy use in scenarios. Package includes: 5Pcs Drill Chucks Adapter