These are well made and durable. These extensions give you an extra reach when you are working in a tight place that a regular socket won't reach. I love these as a great addition to my set of sockets and extensions. These are a 1/2-inch drive that will work with the 1/2-inch sockets. They are made of high-quality steel in a black phosphate finish. There is a three-inch, six-inch, and ten-inch extension to complete my tools. I would recommend these to anyone who needs good tools!