The generic radiators Step wrenches connectors combines 5 in 1 versatility with a 10-21mm hexagonal head ranges and square connection, crafted from delicate high carbon steel for radiators and valves nipple maintenance Its high carbon steel construction delivers excellent hardness and wear resistance, making it long time addition to any radiators tool or valves wrenches adapter set Featuring a multiple sized hexagonal design (10mm, 12mm, 13mm, 16mm, 21mm) and 88mm length, this tool ensures compatibility with traditional heaters while offering space efficient operations Produced for plumbers, HVAC technicians, and craft enthusiasts needing efficient torques control for radiators installations, valves adjustments, or mechanical repairs Perfect for tight space in residential / commercial heating systems, water supply net works, or industrial equipment requiring secure fastener engagement, Manufacturer: OSNIYAW