The Grey Pneumatic 3040UM is a 3/4-inch drive x 40mm standard-length, 6-point metric universal impact socket. It is engineered as a heavy-duty universal joint (u-joint) swivel socket designed specifically for professional automotive, industrial, and high-impact assembly tasks. Key Technical Specifications Drive Size: 3/4"Socket Size: 40 mm (Metric)Socket Points: 6-point hex Material: Chrome-molybdenum (Chro-Moly) alloy steel Physical Dimensions: Drive end diameter of 44 mm, socket end diameter of 60 mm, overall length of 110 mm, and a hex depth of 24 mm. Weight: Approximately 1.8 to 2.34 lbs.