Spiral type electric furnaces for compression springs

Manentimacchine sells spiral type electric furnaces with a maximum temperature of 500 °C; available in three models with the following features:

HF10
Power 1.75 kW
Wire diameter: 1.2mm( .047”)
External diameter: 20mm( .787”)

HF20
Power 3kW
Wire diameter: 2.0mm( .079”)
External diameter: 30mm(1.181”)

HF30
Power 5.4 kW
Wire diameter: 2.5mm( .098”)
External diameter: 40mm(1.575”)