- Designed for plumbers, HVAC technicians, and tradespeople seeking efficient torque control for radiator installations, valve adjustments, or mechanical repairs. - This versatile 5-in-1 radiator step wrench features a hex head range of 10–21 mm and a square connection, crafted from high-quality hardened steel for precise maintenance of radiators and valve nipples. - The hexagonal design includes multiple sizes (10 mm, 12 mm, 13 mm, 16 mm, 21 mm) and an 88 mm length, ensuring compatibility with traditional heating systems while providing space-saving convenience during use. - Constructed from carbon steel, it offers exceptional hardness and wear resistance, making it a durable addition to any radiator tool or valve key adapter set. Use Case Scenarios: 1. Effortlessly install or adjust radiators in tight spaces where traditional tools may not fit, thanks to its compact design and range of sizes. 2. Ensure accurate valve settings during HVAC system maintenance, improving system efficiency and performance. 3. Provide reliable mechanical repairs on heating systems, reducing downtime and enhancing service quality.