As you ve come to expect, the Bottle Rocket features our taper for proper alignment, and installs with an off the shelf 1/2 inch socket. SPECS WEIGHT: 2.6 oz. OVERALL LENGTH: 2.7 Note: Not compatible with 9MM INSTALLATION: RIGHTY TIGHTY TORQUE TO 10-15 FT-LBS RECOMMENDED TOOLS We have seen a wide range of outside diameters for 1/2 inch sockets. 1/4 inch drive sockets are generally the best for the Bottle Rocket, though we have 1/2 inch drive sockets that work as well.