The SR Passives AHP25W-8RF Resistor is a wire-wound, with heatsink, 8-Ohm, 25-Watt, ±1% tolerance flaw, 50ppm/°C temperature coefficient, and 18.6 mm diameter resistor. It is designed for use in some of the most demanding industrial and electrical applications. With its aluminum housing, the resistor is designed to dissipate heat efficiently and operate in extreme temperatures. It is also UL and CSA certified, so it is safe and reliable.