Built for reliability and everyday trade use, the WARR Tools 5mm Radiator Bleed Keys are engineered to deliver smooth, controlled venting of trapped air from domestic and commercial radiators. Manufactured from durable, corrosion‑resistant metal and designed for a secure, comfortable grip, these keys ensure efficient system maintenance with zero fuss. Supplied in a bulk pack of 50, they’re ideal for plumbers, heating engineers, landlords, and maintenance teams who need dependable tools on hand at all times.