Milwaukee 3/8" Drive 3/8"F X 1/2"M Adapter is expertly crafted to be a key component of the most versatile socket family. Featuring the innovative FOUR FLAT™ Sides design, this adapter prevents rolling and is compatible with wrenches for added convenience. The drive sizes are laser etched onto the adapter, ensuring improved and easy-to-read visibility. Its chrome plating provides excellent corrosion and rust protection, making it durable for long-term use. Backed by a lifetime , this adapter is a reliable addition to any mechanic's tool collection. Model Number: 42-04-9111