Aavid Thermalloy KL100-1 TO220 Heat Sink for High Power 3.4°C/W

Aavid Thermalloy type KL100-1. Threaded slot to accommodate a TO220 if preferred. Designed to minimise board space. High power dissipation heatsink. 100mm long, 50mm wide, 28mm high. Can also be used with TO218 and TO3P types.

eBay