Fischer Elektronik Quadratic Heat Sinks - Round Pin - Fischer Elektronik 10006847, The Fischer Elektronik 26.3° Quadratic Heat Sink is a round pin heat sink with outstanding heat conductivity characteristics by material alloy and homogeneous arrangement of material. Uniform distribution of heat in the base and in spike in direction of heat flow. Fischer Elektronik ICK S 10X10X125 26.3°C/W Heat Sink 10x10x12.5mm