The Grey Pneumatic 3166D is a professional-grade 3/4-inch drive x 2-1/16-inch-deep length, 12-point impact socket. Built specifically for heavy-duty industrial and automotive use, it is designed to withstand the high torque demands of pneumatic and cordless impact wrenches. Key Specifications Drive Size: 3/4-inch Socket Size: 2-1/16 inches (SAE / Fractional) Configuration: 12-pointLength Type: Deep length (3.94 inches overall socket length) Material: Chrome-molybdenum alloy steel (Cr-Mo) Weight: 3.2 lbs