General description Sealey AK5500 Premier Impact Universal Joint is designed for use with 1/2" square drive air impact tools. Constructed from drop-forged Chrome Molybdenum steel, this universal joint features a phosphate finish that enhances corrosion resistance, making it suitable for daily professional use. Technical specifications Material: Drop-forged Chrome Molybdenum steel Finish: Phosphate for corrosion resistance Model No.: AK5500 Other information Lifetime guarantee* Features a spring-ball socket retainer and drilled head to accept a retaining pin.