Features SPECIFICATIONS: Includes 3pcs universal joints, with 1/4in 3/8in 1/2in drive size to meet different socket conversion requirements. CRV STEEL: These socket adapters are made of chrome vanadium steel, chrome plated, with high hardness, corrosion resistance. STANDARD SHAPE: These socket adapters are suitable for all hexagonal side handles and has 4 square slots for easy conversion. FINE PROCESSING: With heating and cooling, these universal joints have a high hardness of 60HRC, impact resistant, not easy to deform. MULTIPLE USAGES: Suitable for vehicle modification and maintenance, can be switched to any direction, and can be used for transmission. Specification: Item Type: Universal Joint Material: Chrome Vanadium Steel Hardness: 60HRC Diameter: 1/4in 3/8in 1/2in Use: Suitable for vehicle modification and maintenance. It can be switched to any direction by lightly pressing, and can be applied to gear box. Package List:3 x Universal Joints Package List 3 x Universal Joints