【Apply To】Built for cramped repairs like car engines and wheel areas, this adapter uses adaptable sockets to reach hidden bolts. Switch bits instantly between auto jobs, machinery fixes, and home projects – all in a pocket-sized kit. 【Size】This set includes 10 piece 1/4 to 3/8 drive adapters. Each square head of the adapter has a spring loaded ball bearing assembly that holds the sleeve securely and prevents slippage. 【Premium CR-V Material】Crafted from durable Chrome Vanadium (CR-V) steel. This high-quality construction ensures sockets can withstand the toughest jobs, while the black phosphate surface treatment adds an extra layer of protection against wear, oxidation, and corrosion. 【SIZE CONVERSION】This 3/8” Drive Impact Grade Socket Adapter converts the drive end of a 1/4” hex drive tool, such as an electric wrench, impact wrench, or ratchet wrench, to a 3/8” impact socket interface for compatibility with different sized tools. Ideal for improving work efficiency and providing great convenience for a variety of tasks, this practical accessory is an indispensable tool in your toolkit. 【Reliable After-Sales Protection】Our products have a limited lifetime warranty, if there is any problem with the socket, you can contact us at any time, we are willing to replace it for you at any time.