Aluminum Heat Sink 120 x 64 x 6mm Mini Heatsink Cooling Fin for Cooling Stepper Driver and Generation, Golden : Amazon.co.uk: Business, Industry & Science
sourcingmap 1PC Large Aluminum Heatsink, 4.7" x 3.9" x 0.7" Heat Sink Silver Tone Cooling 16 Fins for IC Module, LED, Amplifier Transistor : Amazon.co.uk: Business, Industry & Science
Aluminium Heatsink for NEMA 17 Stepper Motors - Black | The Pi Hut
PDF) A REVIEW ON POLYMER HEAT SINKS FOR ELECTRONIC COOLING APPLICATIONS