Milwaukee 3/8" X 1/4" Square Socket Adapter is designed with versatility and durability in mind. Featuring FOUR FLAT™ sides, this adapter prevents rolling and is compatible with wrenches, making it a reliable addition to your toolkit. The drive sizes are laser etched onto the adapter for easy-to-read visibility, ensuring you have the right fit. Its chrome plating provides excellent corrosion and rust protection, extending the life of the tool and maintaining its performance over time. Model Number: 42-04-9112