Fischer-Elektronik-Stranded-Extruded-Heatsink-5K-W-for-TO-3-CB-fischer-elektronik-SK-36-50-SA-A-black-anodised-extruded-heatsink-suitable-for-use-with-TO-3-&-CB-drilling-pattern-devices-A-base-thickness-of-4mm-thermal-resistance-of-5-deg-C-W-&-low-weight-make-the-heatsink-ideal-for-a-wide-range-of-applications-SK-36-50-SA-Heat-Sink-5C-W