Aluminum Heat Sink Heatsink Module Cooler Fin for High Power Led Amplifier Transistor Semiconductor Devices with 23 pcs Fins 3.93"(L) x 2.71"(W) x 1.41"(H) / 100mm (L) x 69mm(W) x 36mm(H) :
Zipper Fin Heat Sinks: An Interconnected Solution - Blog
How heat sink fin spacing plays a key role in natural convection cooling and how you can optimize it | Advanced Thermal Solutions