Fischer Elektronik Heatsinks with Combi Punching – Fischer Elektronik SK 01 100 SA, The Fischer Elektronik 2° Cool Rail 111 x 26 x 100mm Heat Sink has been specially developed for semiconductor design TO 3 with combi punching. The effective heat dissipation make it ideal for a wide range of applications. Fischer Elektronik SK 01 100 SA Cool Rail 111 x 26 x 100mm Heat Sink 2°C/W