Fischer elektronik cool rail 97 x 25 x 5075100mm heat sinks fischer elektronik sk 72 75 sa the fischer elektronik 18deg cool rail 97 x 25 x 75mm heat sink has been specially developed for semiconductor design to 3 the effective heat dissipation makes it ideal for a wide range of applications fischer elektronik sk 72 75 sa cool rail 97 x 25 x 75mm heat sink 18cw