Features: 3-piece set: 1/4-inch drive, 3/8-inch drive and 1/2-inch drive impact grade universal joints. Our ball spring design impact universal joint set, thanks to the smooth and simple 360-degree rotation feature. Impact-grade universal joint sockets are made from robust heat treated Chrome Molybdenum alloy steel. Electric and pneumatic impact wrenches, the spring-loaded detent ball securely latches and the through-hole in the drive end locks securely onto the drive for tang. Swivel socket adapters are coated with Phosphate treatment for maximum corrosion/rust for protection These are great for work on your car; no more knuckle cuts from tight spots! Specifications: Material: ‎Chrome Molybdenum Steel 1/2" Size: 70x27x12.5mm/2.76x1.06x0.49in 3/8" Size: 53x22x10mm/2.09x0.87x0.39in 1/4" Size: 44x15x6.35mm/1.73x0.59x0.25in Package Includes: 3X Universal Joint note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.