These LED indicators should not be operated without a suitable series resistor or other current-limiting device. LED Indicator, 8.2mm Mount, Vandal Resistant. Flat polycarbonate transparent fresnel lens Low profile nickel plated brass housing IP64 rated D shaped mounting to prevent rotation 0.11in. (2.8x0.5mm) terminals Supplied with fixing nut and washer Mounting Hole Size: 8.2mm Dia. Operating Temperature: -30 to +85°C