The Grey Pneumatic 4031MD is a premium-grade, 1-inch drive x 31mm metric deep impact socket. It is engineered primarily for professional mechanics and heavy-duty industrial applications using high-torque pneumatic or electric impact wrenches. 🛠️ Key Technical Specifications Drive Size: 1" Square Drive Socket Size: 31 mm Length Type: Deep length (90 mm overall length) Configuration: 6-Point Hex Material: Heat-treated Chrome-Molybdenum (Cr-Mo) Alloy Steel Weight: Approximately 1.72 to 2 lbs