Features: New and high quality Made of precision machined black heat-treated chromium molybdenum steel for high strength, impact resistance, and excellent durability Black phosphate coating helps prevent rust and corrosion, extending tool life Ball spring at the rod end and anti-falling bolt hole in the adapter securely lock the plug in place for safe use and prevent disengagement Available in three sizes: 1/2 inch, 3/8 inch, and 1/4 inch to suit various needs Widely used in equipment installation, factories, production lines, automotive applications, and mechanical maintenance Specifications: Name: Universal Joint Material: Chrome Molybdenum Steel Color: Black Type: 6.35mm, 12.7mm, 9.525mm (optional) Note: No retail packaging May have a 0–1 cm measurement deviation due to manual measurement; please consider this before purchasing Product color may vary slightly due to monitor display differences Package includes: 1 x Joint Socket