Hardware, heatsink. For TO-3 components.
Thermalloy/Aavid THM6054B-SE1
Hardware, heatsink. For TO-3 components. Black, lightweight material. Dimensions: 45.8mm (1.806") square x 32.2mm (1.271") tall and has 20-fins, 5 each side. ID 1.67" and has (2) 6/32 threaded rivets on bottom.