This Proto 1/2" Drive 16mm Deep Well Socket 5316M is a high-quality tool made in the United States. It is an individual wrench assortment that is perfect for professional use. The socket is designed to fit snugly into the crank handle of a wrench and has a well that is deep enough to accommodate most nuts and bolts. The brand PROTO is well-known for its durable and reliable tools, and this socket is no exception. It is perfect for anyone who needs a top-quality socket that will last a long time. Whether you are a mechanic, a carpenter, or someone who needs a good socket for home repairs, this Proto socket is an excellent choice.