Includes 1/2" and 3/4" Sizes. The Namvo universal joint sockets are made from robust heat treated Chrome Molybdenum alloy steel. Designed to pass the test of time: your swivel socket adapters are coated with Manganese Phosphate treatment for maximum corrosion and rust protection. The impact universal joint socket is strong torsion, thick design, suitable for electric and pneumatic tools, great impact resistance. This impact universal joint socket is simple designd and beautiful appearance. The pneumatic universal nozzle is widely used in mining, metallurgy, shipbuilding, auto repair and other industries., Manufacturer: Namvo