Seifert Heatsink, 12K/W, 40 x 27 x 19.1mm, PCB Surface Mount Seifert Heatsink, 12K/W, 40 x 27 x 19.1mm, PCB Surface Mount, Length: 40mm, Width: 27mm, Colour: Black, Package Type: TO-3, MPN: KL176 SW GBP 4.20 1