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 High Strength Hardened Steel: Made from alloy tool steel for hardness and durability, it withstands heavy torqued and resists wear in demanding conditions Recessed Square Designs: The unique recessed square designs evenly distributes force to bolt heads, reducing wear and extending lifespans while improving stability during operations Knurled Antislip Grip: Precisions knurling enhances grip comfort and oil / slip resistance, providing secure handling even in wet conditions for DIYer or professional applications 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, Manufacturer: Kelisdi