This 3-Piece Impact Universal Joint set includes 1/4, 3/8 and 1/2-inch Drive U-Joints. perfect kit for household, automobile repair, mechanical repair, plumbing repair, construction operation, DIY mechanical handwork, etc.Premuim Meterial:Forged from heat-treated chromium-molybdenum steel structure,with black phosphating treatment on the surface, rust-proof, corrosion-resistant and durable. The overall inlay design makes the universal joint perfectly connected, with strong torque and is not easy to fall apart.360°Rotation & 30°Tilt: the reinforced clamp at the interface can ensure flexible 360°rotation and 30°tilt, allowing application in a variety of scenarios and acting on narrow or hard-to-reach spaces.Safety Connection: Anti-detachment steel ball on the head, stable locking and quick disassembly.The anti-dropping square groove at the tail is equipped with a hole bolt to prevent falling off during work. Built-in elastic buffer spring relieves the damage caused by the internal force of the universal joint.Great Compatibility: Universal with international standard interface and market interface rod. Work with sleeve, ratchet, lever, bending rod, lithium electric drill, electric hand drill, electric pneumatic screwdriver, etc