Fischer Elektronik Cool Rail Heat Sinks 200 x 40mm (W x H) – Fischer Elektronik SK 47 75 SA, The Fischer Elektronik 0.85° Cool Rail 200 x 40 x 75mm Heat Sink has an extruded design, with effective heat dissipation ideal for a wide range of applications. Fischer Elektronik SK 47 75 SA Cool Rail 200 x 40 x 75mm Heat Sink 0.85°C/W