fixing nut and spring washer. These LED indicators should not be operated without a suitable series resistor or other current-limiting device. LED Indicators, 6.35mm Mounting, Ultra - Bright OXL / CLH / 63 Series. 4.3mm coloured fresnal polycarbonate low profile style lens 300mm long wire lead connection IP66 sealed 9.0mm Natural aluminium or matt black nickel aluminium finished housing Mounting hole size: 6.35 to 6.55mm Sunlight viewable Shock and vibration resistant Life Expectancy: 90000 Hours