This radiator spud wrench is designed to work with multiple socket sizes, including 1/2 in, 3/8 in, 3/4 in, and 1-1/4 in sockets, enabling a single tool to cover a wide range of plumbing tasks. Durable chrome-vanadium steel construction provides increased longevity and strength, allowing frequent use without degradation. The stepped design enables quick attachment to a standard 1/2 in drive ratchet, making setup fast for both professionals and DIY enthusiasts. Versatile for radiator components such as radiator valves and thermostats, expanding its usefulness in plumbing work. Use scenarios - Servicing heating systems by loosening or tightening radiator valves and thermostats that require different socket sizes. - General plumbing maintenance in tight spaces where a single tool can cover multiple fastener sizes. - Field HVAC repairs where technicians need fast size changes and reliable torque with a single tool.