The sockets and shafts are crafted from long-lasting alloy steel Color-coded handles let you quickly identify the right tool for the job Plastic handles are lightweight and easy to grip 7 Standard (SAE) Nut Drivers including the following sizes: 3/16-in, 1/4-in, 5/16-in, 11/32-in, 3/8-in, 7/16-in, 1/2-in